Feature/release 5.6 (#746)

* Add support for UILayoutPriority as priority target. (#466) * Add support for UILayoutPriority as priority target. * Fixed for tvOS * Add update(priority: ConstraintPriority) method (#467) * Add update(priority: ConstraintPriority) method * Fix copy-paste error * Add Swift Package Manager support (#501) * Swift4.2 (#516) * make ConstraintAttributes conform to ExpressibleByIntegerLiteral (#520) * Adds 'constraint.isActive = bool' to Constraint (#496) * delegate identical 'constraint creation' code to 'prepareConstraints' * adds 'set(isActivated:)' method to call appropriate 'activate/deactivate' based on bool cleans up about 30 lines of if foo { activate } else { deactivate } code in my app * instead of 'set(isActivated:)', use 'isActive = value' * Add swift version to podspec * Update podspec * Update podspec * Update project to get rid of Migration Warning (#547) * Update Swift Language version to 4.2 under build settings (#551) * Update swift language version to 4.2 in build settings * Update podspec * Remove Swift Version file * Remove Package.swift, SnapKit is not SwiftPM compatible anyways * Update Podspec * Update version in Podspec * Support swift 5.0 (#570) * Update swift version 5.0 * Remove needless access control * Fix misused "Available" annotations * Support @unknown default * Support swift 5.0 in test code * Update podspec * Update travis CI * Code review by @freak4pc * Add constraint for Swift version * Fix build failed * [EXC_BAD_ACCESS] Update LayoutConstraint == operator to support iOS 10 and higher changes (#574) * @sashabelonogov Update LayoutConstraint == operator to support iOS 10 and higher changes * Simplify return statement of the LayoutConstraint == operator * Fix incorrect behavior of inset with center and baseline anchors (#569) * Fix insets adjusting center attributes incorrectly * Fix insets adjusting baseline attributes incorrectly * Add back Package.swift for SwiftPM compatibility (#559) reverts 477fffae4c * Update podspec * Update min target versions * Update min target versions * Update README.md * Update README.md * Revert "[EXC_BAD_ACCESS] Update LayoutConstraint == operator to support iOS 10 and higher changes (#574)" (#593) This reverts commit bc2b0b9332. * Update Podspec * Bump min version requirements * Fix layout constraint comparison * Fix equality check for iOS * Adds support for NSDirectionalEdgeInsets as an inset constant (#594) * Make ConstraintViewDSL content priorities nonmutating (#586) * Adds two new compositions – DirectionalEdges and DirectionalMargins (#595) * WIP * Add directional margins * Whitespace * Add Playground Sample (#608) * added updates to Package.swift so it can be imported with Xcode 11 (#615) * Revert #574 * Update Podspec * Add background color to quick start box in README.md (#619) * add-dimensional-edges: add ConstraintItems horizontalEdges, verticalEdges, directionalHorizontalEdges and directionalVerticalEdges as convenience items to express left+right, top+bottom or leading+trailing (#637) * Update deprecations to allow Xcode to auto-fixup. (#634) * Migrate to Xcode 11 and updated travis.yml (#629) * Migrate to Xcode 11 and updated travis.yml * Travis to support Xcode 11 * project.pbxproj: Update to recommended settings. (#627) * Add test assert to unit test testCanSetLabel. (#625) * Add back support for OS X 10.11 (#645) * Use << for ConstraintAttributes options (#659) * Use << for ConstraintAttributes options * iPhone 6s is not supported by the latest Xcode * Add method getting constraint with closure to ConstraintMakerRelatable (#663) * add ConstraintMakerRelatable extension * fix fatalError message Co-authored-by: Jimi <jimi-hpcnt@hpcnt.com> * Xcode 12 and SwiftPM enhancements * Update README to include SPM installation notes (#673) * Fix typo * Remove duplicate file * xcodeproject configuration enhancement for localization (#584) Co-authored-by: AmrAngry <c_amr.elghadban@smartdubai.ae> * Updates to project files * Dynamic Product (#710) This PR adds a dynamic product to SnapKit. Having a dynamic product is important in modular project structures; multiple packages may be using SnapKit, and this allows that support without the end-user have to wrap SnapKit in their own package that exposes it and using that package in lieu of SnapKit. * Fix warning about `class` (#714) * Added Example-iOS.xcdodeproj and fixed examples (#707) * Update README.md, add missing Migration Guides section (#721) * Make ConstraintMaker.item public (#693) * Typo source directory in Podspec (#738) Source directory has been renamed in 18608ead65 * Release 5.6 * Update urls in readme * Update podspec version Co-authored-by: Benjamin Chrobot <benjamin.blair.chrobot@gmail.com> Co-authored-by: Linus Unnebäck <linus@folkdatorn.se> Co-authored-by: Mauro Vime Castillo <mvimeapps@gmail.com> Co-authored-by: o(￣へ￣)o <guzhenhuaGitHub@users.noreply.github.com> Co-authored-by: Colin T.A. Gray <colinta@gmail.com> Co-authored-by: Shai Mishali <freak4pc@gmail.com> Co-authored-by: Ibrahim Koteish <ikteish@yahoo.com> Co-authored-by: Jungwon An <kawoou@kawoou.kr> Co-authored-by: Alexander Belonogov <sashabelonogov@gmail.com> Co-authored-by: Christian Schnorr <christian.schnorr@me.com> Co-authored-by: Josh Converse <josh.converse@gmail.com> Co-authored-by: Vitalii Budnik <nekrich@users.noreply.github.com> Co-authored-by: Shiva Huang <shiva.tw@gmail.com> Co-authored-by: Max Cobb <5754073+maxxfrazer@users.noreply.github.com> Co-authored-by: Liam Elmore <32336260+iosmo@users.noreply.github.com> Co-authored-by: Sven Driemecker <sven.dr@gmx.de> Co-authored-by: Alex Simpson <alexandersimpson94@gmail.com> Co-authored-by: pushp1989 <54930194+pushp1989@users.noreply.github.com> Co-authored-by: Ben Yohay <ben@lightricks.com> Co-authored-by: Natascha Fadeeva <nataschafadeeva@aol.de> Co-authored-by: Wang, Chi <patr0nus@users.noreply.github.com> Co-authored-by: Roman Podymov <podymfrombryansk@yandex.ru> Co-authored-by: wotjd <wotjd971102@gmail.com> Co-authored-by: Jimi <jimi-hpcnt@hpcnt.com> Co-authored-by: Samuel Eshun <samueleshun15@gmail.com> Co-authored-by: Amr Elghadban <amr.elghadban@gmail.com> Co-authored-by: AmrAngry <c_amr.elghadban@smartdubai.ae> Co-authored-by: Hesham Salman <iron-ham@github.com> Co-authored-by: Mr. Ming <minglq.9@gmail.com> Co-authored-by: Teameh <tiemevanveen@hotmail.com> Co-authored-by: Josip Rezić <josip.rezic@hotmail.com> Co-authored-by: Rhett Tuan <devindwan@gmail.com> Co-authored-by: Damien Debin <ddebin@users.noreply.github.com> Co-authored-by: Robert Payne <robertjpayne@Roberts-MacBook-Pro.local>
2022-04-13 16:06:06 +12:00 · 2022-04-13 16:06:06 +12:00 · 851bbf8dd8
parent d4cb974b3e
commit 851bbf8dd8
61 changed files with 1429 additions and 353 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,4 @@
 .build/
 project.xcworkspace
 xcuserdata
 Examples/
@ -5,3 +6,4 @@ Examples/
 Gemfile
 Gemfile.lock
 *.sketch
 .swiftpm
--- a/.swift-version
+++ b/.swift-version
@ -1 +0,0 @@
 4.0
--- a/.travis.yml
+++ b/.travis.yml
@ -1,10 +1,10 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode11
 env:
-  - ACTION=test  PLATFORM=Mac     DESTINATION='platform=OS X'
+  - ACTION=test  PLATFORM=Mac     DESTINATION='platform=macOS'
-  - ACTION=test  PLATFORM=iOS     DESTINATION='platform=iOS Simulator,name=iPhone 6S'
+  - ACTION=test  PLATFORM=iOS     DESTINATION='platform=iOS Simulator,name=iPhone 8'
-  - ACTION=test  PLATFORM=tvOS    DESTINATION='platform=tvOS Simulator,name=Apple TV 1080p'
+  - ACTION=test  PLATFORM=tvOS    DESTINATION='platform=tvOS Simulator,name=Apple TV 4K (at 1080p)'
 script:
  - set -o pipefail && xcodebuild -scheme SnapKit -destination "$DESTINATION" $ACTION | xcpretty
--- a/Example-iOS/AppDelegate.swift
+++ b/Example-iOS/AppDelegate.swift
@ -13,7 +13,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        self.window = UIWindow(frame: UIScreen.main.bounds)
@ -27,4 +27,4 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
        return true
    }
-}
+}
--- a/Example-iOS/Assets.xcassets/AccentColor.colorset/Contents.json
+++ b/Example-iOS/Assets.xcassets/AccentColor.colorset/Contents.json
@ -0,0 +1,11 @@
 {
  "colors" : [
    {
      "idiom" : "universal"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
 }
--- a/Example-iOS/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/Example-iOS/Assets.xcassets/AppIcon.appiconset/Contents.json
@ -2,37 +2,52 @@
  "images" : [
    {
      "idiom" : "iphone",
-      "size" : "29x29",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "20x20"
    },
    {
      "idiom" : "iphone",
-      "size" : "29x29",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "20x20"
    },
    {
      "idiom" : "iphone",
-      "size" : "40x40",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "29x29"
    },
    {
      "idiom" : "iphone",
-      "size" : "40x40",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "29x29"
    },
    {
      "idiom" : "iphone",
-      "size" : "60x60",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "40x40"
    },
    {
      "idiom" : "iphone",
-      "size" : "60x60",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "40x40"
    },
    {
      "idiom" : "iphone",
      "scale" : "2x",
      "size" : "60x60"
    },
    {
      "idiom" : "iphone",
      "scale" : "3x",
      "size" : "60x60"
    },
    {
      "idiom" : "ios-marketing",
      "scale" : "1x",
      "size" : "1024x1024"
    }
  ],
  "info" : {
-    "version" : 1,
+    "author" : "xcode",
-    "author" : "xcode"
+    "version" : 1
  }
-}
+}
--- a/Example-iOS/Assets.xcassets/Contents.json
+++ b/Example-iOS/Assets.xcassets/Contents.json
@ -0,0 +1,6 @@
 {
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
 }
--- a/Example-iOS/Example-iOS.xcodeproj/project.pbxproj
+++ b/Example-iOS/Example-iOS.xcodeproj/project.pbxproj
@ -0,0 +1,360 @@
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 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.5;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
 		};
 		44477D8325D86846009F5E40 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.Example-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
 		44477D8425D86846009F5E40 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.Example-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
 /* End XCBuildConfiguration section */
 /* Begin XCConfigurationList section */
 		44477D6925D86845009F5E40 /* Build configuration list for PBXProject "Example-iOS" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				44477D8025D86846009F5E40 /* Debug */,
 				44477D8125D86846009F5E40 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
 		44477D8225D86846009F5E40 /* Build configuration list for PBXNativeTarget "Example-iOS" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				44477D8325D86846009F5E40 /* Debug */,
 				44477D8425D86846009F5E40 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 /* Begin XCSwiftPackageProductDependency section */
 		440B452A25D86C0100334F54 /* SnapKit */ = {
 			isa = XCSwiftPackageProductDependency;
 			productName = SnapKit;
 		};
 /* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 44477D6625D86845009F5E40 /* Project object */;
 }
--- a/Example-iOS/ListViewController.swift
+++ b/Example-iOS/ListViewController.swift
@ -39,8 +39,8 @@ class ListViewController: UITableViewController {
            let viewController = SimpleLayoutViewController()
            navigationController?.pushViewController(viewController, animated: true)
        } else if indexPath.row == 1 {
-            let viewController = ViewController()
+            let viewController = BasicUIScrollViewController()
            navigationController?.pushViewController(viewController, animated: true)
        }
    }
-}
+}
--- a/Package.swift
+++ b/Package.swift
@ -1,3 +1,4 @@
 // swift-tools-version:5.0
 //
 //  SnapKit
 //
@ -25,5 +26,21 @@
 import PackageDescription
 let package = Package(
-    name: "SnapKit"
+    name: "SnapKit",
    platforms: [
        .iOS(.v10),
        .macOS(.v10_11),
        .tvOS(.v10)
    ],
    products: [
        .library(name: "SnapKit", targets: ["SnapKit"]),
        .library(name: "SnapKit-Dynamic", type: .dynamic, targets: ["SnapKit"]),
    ],
    targets: [
        .target(name: "SnapKit", path: "Sources"),
        .testTarget(name: "SnapKitTests", dependencies: ["SnapKit"]),
    ],
    swiftLanguageVersions: [
        .v5
    ]
 )
--- a/README.md
+++ b/README.md
@ -1,4 +1,4 @@
-<img src="http://snapkit.io/images/banner.jpg" alt="" />
+<img src="https://snapkit.github.io/SnapKit/images/banner.jpg" alt="" />
 SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
@ -7,8 +7,8 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 [![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
-#### ⚠️ **To use with Swift 3.x please ensure you are using >= 3.0.0** ⚠️ 
+#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️
-#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️ 
+#### ⚠️ **To use with Swift 5.x please ensure you are using >= 5.0.0** ⚠️
 ## Contents
@ -22,9 +22,13 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 ## Requirements
- iOS 8.0+ / Mac OS X 10.11+ / tvOS 9.0+
+- iOS 10.0+ / Mac OS X 10.12+ / tvOS 10.0+
- Xcode 9.0+
+- Xcode 10.0+
- Swift 3.0+
+- Swift 4.0+
 ## Migration Guides
 - [SnapKit 3.0 Migration Guide](Documentation/SnapKit%203.0%20Migration%20Guide.md)
 ## Communication
@ -55,7 +59,7 @@ platform :ios, '10.0'
 use_frameworks!
 target '<Your Target Name>' do
-    pod 'SnapKit', '~> 4.0.0'
+    pod 'SnapKit', '~> 5.6.0'
 end
 ```
@ -79,11 +83,25 @@ $ brew install carthage
 To integrate SnapKit into your Xcode project using Carthage, specify it in your `Cartfile`:
 ```ogdl
-github "SnapKit/SnapKit" ~> 4.0.0
+github "SnapKit/SnapKit" ~> 5.0.0
 ```
 Run `carthage update` to build the framework and drag the built `SnapKit.framework` into your Xcode project.
 ### Swift Package Manager
 [Swift Package Manager](https://swift.org/package-manager/) is a tool for managing the distribution of Swift code. It’s integrated with the Swift build system to automate the process of downloading, compiling, and linking dependencies.
 > Xcode 11+ is required to build SnapKit using Swift Package Manager.
 To integrate SnapKit into your Xcode project using Swift Package Manager, add it to the dependencies value of your `Package.swift`:
 ```swift
 dependencies: [
    .package(url: "https://github.com/SnapKit/SnapKit.git", .upToNextMajor(from: "5.0.1"))
 ]
 ```
 ### Manually
 If you prefer not to use either of the aforementioned dependency managers, you can integrate SnapKit into your project manually.
@ -105,6 +123,7 @@ class MyViewController: UIViewController {
        super.viewDidLoad()
        self.view.addSubview(box)
        box.backgroundColor = .green
        box.snp.makeConstraints { (make) -> Void in
           make.width.height.equalTo(50)
           make.center.equalTo(self.view)
@ -114,10 +133,17 @@ class MyViewController: UIViewController {
 }
 ```
 ### Playground
 You can try SnapKit in Playground.
 **Note:**
 > To try SnapKit in playground, open `SnapKit.xcworkspace` and build SnapKit.framework for any simulator first.
 ### Resources
- [Documentation](http://snapkit.io/docs/)
+- [Documentation](https://snapkit.github.io/SnapKit/docs/)
- [F.A.Q.](http://snapkit.io/faq/)
+- [F.A.Q.](https://snapkit.github.io/SnapKit/faq/)
 ## Credits
--- a/SnapKit.podspec
+++ b/SnapKit.podspec
@ -1,18 +1,18 @@
 Pod::Spec.new do |s|
  s.name = 'SnapKit'
-  s.version = '4.0.0'
+  s.version = '5.6.0'
  s.license = 'MIT'
  s.summary = 'Harness the power of auto layout with a simplified, chainable, and compile time safe syntax.'
  s.homepage = 'https://github.com/SnapKit/SnapKit'
  s.authors = { 'Robert Payne' => 'robertpayne@me.com' }
  s.social_media_url = 'http://twitter.com/robertjpayne'
-  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '4.0.0' }
+  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '5.0.1' }
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '10.0'
  s.osx.deployment_target = '10.11'
-  s.tvos.deployment_target = '9.0'
+  s.tvos.deployment_target = '10.0'
-  s.source_files = 'Source/*.swift'
+  s.source_files = 'Sources/*.swift'
-  s.requires_arc = true
+  s.swift_version = '5.0'
 end
--- a/SnapKit.xcodeproj/project.pbxproj
+++ b/SnapKit.xcodeproj/project.pbxproj
@ -8,6 +8,9 @@
 /* Begin PBXBuildFile section */
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 		EE235F701C5785C600C08960 /* ConstraintDescription.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F631C5785C600C08960 /* ConstraintDescription.swift */; };
@ -26,7 +29,7 @@
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 		EE235FAF1C5785D400C08960 /* ConstraintMakerFinalizable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FA71C5785D400C08960 /* ConstraintMakerFinalizable.swift */; };
-		EE235FB21C5785D400C08960 /* ConstraintMakerPriortizable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FA81C5785D400C08960 /* ConstraintMakerPriortizable.swift */; };
+		EE235FB21C5785D400C08960 /* ConstraintMakerPrioritizable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */; };
 		EE235FB51C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FA91C5785D400C08960 /* ConstraintMakerEditable.swift */; };
 		EE235FB81C5785D400C08960 /* ConstraintMakerRelatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FAA1C5785D400C08960 /* ConstraintMakerRelatable.swift */; };
 		EE235FBB1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FAB1C5785D400C08960 /* ConstraintMakerExtendable.swift */; };
@ -36,7 +39,6 @@
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 		EE6087751E4F133E0029CF84 /* ConstraintPriority.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE6087741E4F133E0029CF84 /* ConstraintPriority.swift */; };
 		EE6898CB1DA7B3A100D47F33 /* LayoutConstraintItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE6898CA1DA7B3A100D47F33 /* LayoutConstraintItem.swift */; };
 		EECDB3741AC0C9B6006BBC11 /* SnapKit.h in Headers */ = {isa = PBXBuildFile; fileRef = EECDB3661AC0C95C006BBC11 /* SnapKit.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		EECDB3931AC0CB52006BBC11 /* Tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = EECDB36A1AC0C95C006BBC11 /* Tests.swift */; };
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@ -48,7 +50,10 @@
 /* Begin PBXFileReference section */
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 		EE235F631C5785C600C08960 /* ConstraintDescription.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintDescription.swift; sourceTree = "<group>"; };
@ -67,7 +72,7 @@
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 		EE235FA61C5785D400C08960 /* ConstraintMaker.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMaker.swift; sourceTree = "<group>"; };
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-		EE235FA81C5785D400C08960 /* ConstraintMakerPriortizable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMakerPriortizable.swift; sourceTree = "<group>"; };
+		EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMakerPrioritizable.swift; sourceTree = "<group>"; };
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@ -76,14 +81,13 @@
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 		EEBCC9D819CC627D0083B827 /* SnapKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SnapKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
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-		EECDB3641AC0C95C006BBC11 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		EECDB3691AC0C95C006BBC11 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = Info.plist; path = SnapKitTests/Info.plist; sourceTree = "<group>"; };
-		EECDB3661AC0C95C006BBC11 /* SnapKit.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SnapKit.h; sourceTree = "<group>"; };
+		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Tests.swift; path = SnapKitTests/Tests.swift; sourceTree = "<group>"; };
 		EECDB3691AC0C95C006BBC11 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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@ -114,7 +118,8 @@
 		DDC9FD8C1981B4DD009612C7 = {
 			isa = PBXGroup;
 			children = (
-				EECDB35D1AC0C95C006BBC11 /* Source */,
+				EE6DB557251D9A6B00E0C374 /* Supporting Files */,
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 				EE94F60C1AC0F113008767FF /* Frameworks */,
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@ -135,6 +140,7 @@
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 				3CA7D6C124592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift */,
 			);
 			name = Extensions;
 			sourceTree = "<group>";
@ -155,7 +161,7 @@
 			children = (
 				EE235FA61C5785D400C08960 /* ConstraintMaker.swift */,
 				EE235FA71C5785D400C08960 /* ConstraintMakerFinalizable.swift */,
-				EE235FA81C5785D400C08960 /* ConstraintMakerPriortizable.swift */,
+				EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */,
 				EE235FA91C5785D400C08960 /* ConstraintMakerEditable.swift */,
 				EE235FAA1C5785D400C08960 /* ConstraintMakerRelatable.swift */,
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@ -172,6 +178,7 @@
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 			name = Targets;
 			sourceTree = "<group>";
@ -183,6 +190,7 @@
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 				7E1CB2AF227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift */,
 				EE235F651C5785C600C08960 /* ConstraintConfig.swift */,
 				EE235F661C5785C600C08960 /* ConstraintView.swift */,
 				EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */,
@ -205,6 +213,14 @@
 			name = Debugging;
 			sourceTree = "<group>";
 		};
 		EE6DB557251D9A6B00E0C374 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
 				EE6DB559251D9A6B00E0C374 /* Info.plist */,
 			);
 			path = "Supporting Files";
 			sourceTree = "<group>";
 		};
 		EE94F60C1AC0F113008767FF /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
@ -215,20 +231,18 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
-		EECDB35D1AC0C95C006BBC11 /* Source */ = {
+		EECDB35D1AC0C95C006BBC11 /* Sources */ = {
 			isa = PBXGroup;
 			children = (
 				EECDB3661AC0C95C006BBC11 /* SnapKit.h */,
 				EE235F581C57858700C08960 /* Extensions */,
 				EE235F591C57859200C08960 /* DSLs */,
 				EE235F5A1C57859900C08960 /* Maker */,
 				EE235F5B1C57859E00C08960 /* Targets */,
 				EE235F5C1C5785A400C08960 /* Models */,
 				EE235F5D1C5785AC00C08960 /* Debugging */,
 				EECDB36B1AC0C967006BBC11 /* Supporting Files */,
 				EECDB3681AC0C95C006BBC11 /* Tests */,
 			);
-			path = Source;
+			path = Sources;
 			sourceTree = "<group>";
 		};
 		EECDB3681AC0C95C006BBC11 /* Tests */ = {
@ -241,14 +255,6 @@
 			path = ../Tests;
 			sourceTree = "<group>";
 		};
 		EECDB36B1AC0C967006BBC11 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
 				EECDB3641AC0C95C006BBC11 /* Info.plist */,
 			);
 			name = "Supporting Files";
 			sourceTree = "<group>";
 		};
 /* End PBXGroup section */
 /* Begin PBXHeadersBuildPhase section */
@ -256,7 +262,6 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
 				EECDB3741AC0C9B6006BBC11 /* SnapKit.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@ -305,23 +310,23 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 1230;
 				ORGANIZATIONNAME = "SnapKit Team";
 				TargetAttributes = {
 					EEBCC9D719CC627D0083B827 = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0900;
+						LastSwiftMigration = 1020;
 					};
 					EEBCC9E119CC627D0083B827 = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0900;
+						LastSwiftMigration = 1020;
 						ProvisioningStyle = Automatic;
 					};
 				};
 			};
 			buildConfigurationList = DDC9FD901981B4DD009612C7 /* Build configuration list for PBXProject "SnapKit" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
@ -371,6 +376,7 @@
 				EE235FB51C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */,
 				EEF68FBC1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAC1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
 				7E1CB2AE227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift in Sources */,
 				EE6087751E4F133E0029CF84 /* ConstraintPriority.swift in Sources */,
 				EE235F941C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
 				EEF68FA61D784A5300980C26 /* ConstraintDSL.swift in Sources */,
@ -384,13 +390,15 @@
 				EE235F6D1C5785C600C08960 /* Constraint.swift in Sources */,
 				EE235F791C5785C600C08960 /* ConstraintView.swift in Sources */,
 				EE6898CB1DA7B3A100D47F33 /* LayoutConstraintItem.swift in Sources */,
-				EE235FB21C5785D400C08960 /* ConstraintMakerPriortizable.swift in Sources */,
+				EE235FB21C5785D400C08960 /* ConstraintMakerPrioritizable.swift in Sources */,
 				EE235F8B1C5785C600C08960 /* LayoutConstraint.swift in Sources */,
 				7E1CB2B0227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift in Sources */,
 				EE235FA31C5785CE00C08960 /* ConstraintInsetTarget.swift in Sources */,
 				EE235F9D1C5785CE00C08960 /* ConstraintMultiplierTarget.swift in Sources */,
 				EE235FC01C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */,
 				EE235F5F1C5785BC00C08960 /* Debugging.swift in Sources */,
 				EE235FC31C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */,
 				3CA7D6C224592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift in Sources */,
 				EE235F7F1C5785C600C08960 /* ConstraintRelation.swift in Sources */,
 				EEF68FB41D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */,
 				EE235F701C5785C600C08960 /* ConstraintDescription.swift in Sources */,
@ -412,6 +420,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@ -420,14 +429,17 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@ -469,6 +481,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@ -477,14 +490,17 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@ -523,15 +539,17 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = "$(SRCROOT)/Source/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Supporting Files/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_BUNDLE_PACKAGE_TYPE = FMWK;
 				PRODUCT_NAME = SnapKit;
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Debug;
@ -546,14 +564,16 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = "$(SRCROOT)/Source/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Supporting Files/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_BUNDLE_PACKAGE_TYPE = FMWK;
 				PRODUCT_NAME = SnapKit;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Release;
@ -563,11 +583,13 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@ -576,12 +598,14 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
--- a/SnapKit.xcodeproj/xcshareddata/xcschemes/SnapKit.xcscheme
+++ b/SnapKit.xcodeproj/xcshareddata/xcschemes/SnapKit.xcscheme
@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1230"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@ -27,6 +27,15 @@
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
      shouldUseLaunchSchemeArgsEnv = "YES">
      <MacroExpansion>
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "EEBCC9D719CC627D0083B827"
            BuildableName = "SnapKit.framework"
            BlueprintName = "SnapKit"
            ReferencedContainer = "container:SnapKit.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <Testables>
         <TestableReference
            skipped = "NO">
@ -39,17 +48,6 @@
            </BuildableReference>
         </TestableReference>
      </Testables>
      <MacroExpansion>
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "EEBCC9D719CC627D0083B827"
            BuildableName = "SnapKit.framework"
            BlueprintName = "SnapKit"
            ReferencedContainer = "container:SnapKit.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <AdditionalOptions>
      </AdditionalOptions>
   </TestAction>
   <LaunchAction
      buildConfiguration = "Debug"
@ -70,8 +68,6 @@
            ReferencedContainer = "container:SnapKit.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <AdditionalOptions>
      </AdditionalOptions>
   </LaunchAction>
   <ProfileAction
      buildConfiguration = "Release"
--- a/SnapKit.xcworkspace/contents.xcworkspacedata
+++ b/SnapKit.xcworkspace/contents.xcworkspacedata
@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
   version = "1.0">
   <FileRef
      location = "group:SnapKitPlayground.playground">
   </FileRef>
   <FileRef
      location = "container:SnapKit.xcodeproj">
   </FileRef>
--- a/SnapKit.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/SnapKit.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@ -0,0 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
 	<key>IDEDidComputeMac32BitWarning</key>
 	<true/>
 </dict>
 </plist>
--- a/SnapKitPlayground.playground/Contents.swift
+++ b/SnapKitPlayground.playground/Contents.swift
@ -0,0 +1,29 @@
 //: A UIKit based Playground for presenting user interface
 // To use this playground, build SnapKit.framework for any simulator first.
 import SnapKit
 import UIKit
 import PlaygroundSupport
 class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white
        let label = UILabel()
        label.text = "Hello World!"
        label.textColor = .black
        view.addSubview(label)
        label.snp.makeConstraints { (make) in
            make.left.equalToSuperview().offset(150)
            make.top.equalToSuperview().offset(200)
            make.size.equalTo(CGSize(width: 200, height: 20))
        }
        self.view = view
    }
 }
 // Present the view controller in the Live View window
 PlaygroundPage.current.liveView = MyViewController()
--- a/SnapKitPlayground.playground/contents.xcplayground
+++ b/SnapKitPlayground.playground/contents.xcplayground
@ -0,0 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <playground version='5.0' target-platform='ios' executeOnSourceChanges='true'>
    <timeline fileName='timeline.xctimeline'/>
 </playground>
--- a/SnapKitPlayground.playground/playground.xcworkspace/contents.xcworkspacedata
+++ b/SnapKitPlayground.playground/playground.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
   version = "1.0">
 </Workspace>
--- a/SnapKitPlayground.playground/timeline.xctimeline
+++ b/SnapKitPlayground.playground/timeline.xctimeline
@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Timeline
   version = "3.0">
   <TimelineItems>
   </TimelineItems>
 </Timeline>
--- a/Source/ConstraintView+Extensions.swift
+++ b/Source/ConstraintView+Extensions.swift
@ -1,152 +0,0 @@
 //
 //  SnapKit
 //
 //  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
 //  in the Software without restriction, including without limitation the rights
 //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 //  copies of the Software, and to permit persons to whom the Software is
 //  furnished to do so, subject to the following conditions:
 //
 //  The above copyright notice and this permission notice shall be included in
 //  all copies or substantial portions of the Software.
 //
 //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
 #if os(iOS) || os(tvOS)
    import UIKit
 #else
    import AppKit
 #endif
 public extension ConstraintView {
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_left: ConstraintItem { return self.snp.left }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_top: ConstraintItem { return self.snp.top }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_right: ConstraintItem { return self.snp.right }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_bottom: ConstraintItem { return self.snp.bottom }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_leading: ConstraintItem { return self.snp.leading }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_trailing: ConstraintItem { return self.snp.trailing }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_width: ConstraintItem { return self.snp.width }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_height: ConstraintItem { return self.snp.height }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_centerX: ConstraintItem { return self.snp.centerX }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_centerY: ConstraintItem { return self.snp.centerY }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_baseline: ConstraintItem { return self.snp.baseline }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, OSX 10.11, *)
    public var snp_lastBaseline: ConstraintItem { return self.snp.lastBaseline }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, OSX 10.11, *)
    public var snp_firstBaseline: ConstraintItem { return self.snp.firstBaseline }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_leftMargin: ConstraintItem { return self.snp.leftMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_topMargin: ConstraintItem { return self.snp.topMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_rightMargin: ConstraintItem { return self.snp.rightMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_bottomMargin: ConstraintItem { return self.snp.bottomMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_leadingMargin: ConstraintItem { return self.snp.leadingMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_trailingMargin: ConstraintItem { return self.snp.trailingMargin }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_centerXWithinMargins: ConstraintItem { return self.snp.centerXWithinMargins }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_centerYWithinMargins: ConstraintItem { return self.snp.centerYWithinMargins }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_edges: ConstraintItem { return self.snp.edges }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_size: ConstraintItem { return self.snp.size }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public var snp_center: ConstraintItem { return self.snp.center }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_margins: ConstraintItem { return self.snp.margins }
    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
    @available(iOS 8.0, *)
    public var snp_centerWithinMargins: ConstraintItem { return self.snp.centerWithinMargins }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public func snp_prepareConstraints(_ closure: (_ make: ConstraintMaker) -> Void) -> [Constraint] {
        return self.snp.prepareConstraints(closure)
    }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public func snp_makeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.makeConstraints(closure)
    }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public func snp_remakeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.remakeConstraints(closure)
    }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public func snp_updateConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.updateConstraints(closure)
    }
    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
    public func snp_removeConstraints() {
        self.snp.removeConstraints()
    }
    public var snp: ConstraintViewDSL {
        return ConstraintViewDSL(view: self)
    }
 }
--- a/Sources/Constraint.swift
+++ b/Sources/Constraint.swift
@ -49,12 +49,23 @@ public final class Constraint {
    public var layoutConstraints: [LayoutConstraint]
    public var isActive: Bool {
-        for layoutConstraint in self.layoutConstraints {
+        set {
-            if layoutConstraint.isActive {
+            if newValue {
-                return true
+                activate()
            }
            else {
                deactivate()
            }
        }
-        return false
+        
        get {
            for layoutConstraint in self.layoutConstraints {
                if layoutConstraint.isActive {
                    return true
                }
            }
            return false
        }
    }
    // MARK: Initialization
@ -118,6 +129,32 @@ public final class Constraint {
                        default:
                            fatalError()
                        }
                    } else if self.from.attributes == .directionalEdges && self.to.attributes == .directionalMargins {
                      switch layoutFromAttribute {
                      case .leading:
                        layoutToAttribute = .leadingMargin
                      case .trailing:
                        layoutToAttribute = .trailingMargin
                      case .top:
                        layoutToAttribute = .topMargin
                      case .bottom:
                        layoutToAttribute = .bottomMargin
                      default:
                        fatalError()
                      }
                    } else if self.from.attributes == .directionalMargins && self.to.attributes == .directionalEdges {
                      switch layoutFromAttribute {
                      case .leadingMargin:
                        layoutToAttribute = .leading
                      case .trailingMargin:
                        layoutToAttribute = .trailing
                      case .topMargin:
                        layoutToAttribute = .top
                      case .bottomMargin:
                        layoutToAttribute = .bottom
                      default:
                        fatalError()
                      }
                    } else if self.from.attributes == self.to.attributes {
                        layoutToAttribute = layoutFromAttribute
                    } else {
@ -178,12 +215,12 @@ public final class Constraint {
    // MARK: Public
-    @available(*, deprecated:3.0, message:"Use activate().")
+    @available(*, deprecated, renamed:"activate()")
    public func install() {
        self.activate()
    }
-    @available(*, deprecated:3.0, message:"Use deactivate().")
+    @available(*, deprecated, renamed:"deactivate()")
    public func uninstall() {
        self.deactivate()
    }
@ -208,31 +245,46 @@ public final class Constraint {
        return self
    }
    #if os(iOS) || os(tvOS)
    @discardableResult
    @available(iOS 11.0, tvOS 11.0, *)
    public func update(inset: ConstraintDirectionalInsetTarget) -> Constraint {
      self.constant = inset.constraintDirectionalInsetTargetValue
      return self
    }
    #endif
    @discardableResult
    public func update(priority: ConstraintPriorityTarget) -> Constraint {
        self.priority = priority.constraintPriorityTargetValue
        return self
    }
-    @available(*, deprecated:3.0, message:"Use update(offset: ConstraintOffsetTarget) instead.")
+    @discardableResult
    public func update(priority: ConstraintPriority) -> Constraint {
        self.priority = priority.value
        return self
    }
    @available(*, deprecated, renamed:"update(offset:)")
    public func updateOffset(amount: ConstraintOffsetTarget) -> Void { self.update(offset: amount) }
-    @available(*, deprecated:3.0, message:"Use update(inset: ConstraintInsetTarget) instead.")
+    @available(*, deprecated, renamed:"update(inset:)")
    public func updateInsets(amount: ConstraintInsetTarget) -> Void { self.update(inset: amount) }
-    @available(*, deprecated:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, renamed:"update(priority:)")
    public func updatePriority(amount: ConstraintPriorityTarget) -> Void { self.update(priority: amount) }
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
    public func updatePriorityRequired() -> Void {}
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
    public func updatePriorityHigh() -> Void { fatalError("Must be implemented by Concrete subclass.") }
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
    public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
    public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
    // MARK: Internal
--- a/Sources/ConstraintAttributes.swift
+++ b/Sources/ConstraintAttributes.swift
@ -28,7 +28,9 @@
 #endif
-internal struct ConstraintAttributes : OptionSet {
+internal struct ConstraintAttributes : OptionSet, ExpressibleByIntegerLiteral {
    typealias IntegerLiteralType = UInt
    internal init(rawValue: UInt) {
        self.rawValue = rawValue
@ -39,10 +41,13 @@ internal struct ConstraintAttributes : OptionSet {
    internal init(nilLiteral: ()) {
        self.rawValue = 0
    }
    internal init(integerLiteral rawValue: IntegerLiteralType) {
        self.init(rawValue: rawValue)
    }
    internal private(set) var rawValue: UInt
-    internal static var allZeros: ConstraintAttributes { return self.init(0) }
+    internal static var allZeros: ConstraintAttributes { return 0 }
-    internal static func convertFromNilLiteral() -> ConstraintAttributes { return self.init(0) }
+    internal static func convertFromNilLiteral() -> ConstraintAttributes { return 0 }
    internal var boolValue: Bool { return self.rawValue != 0 }
    internal func toRaw() -> UInt { return self.rawValue }
@ -51,57 +56,65 @@ internal struct ConstraintAttributes : OptionSet {
    // normal
-    internal static var none: ConstraintAttributes { return self.init(0) }
+    internal static let none: ConstraintAttributes = 0
-    internal static var left: ConstraintAttributes { return self.init(1) }
+    internal static let left: ConstraintAttributes = ConstraintAttributes(UInt(1) << 0)
-    internal static var top: ConstraintAttributes {  return self.init(2) }
+    internal static let top: ConstraintAttributes = ConstraintAttributes(UInt(1) << 1)
-    internal static var right: ConstraintAttributes { return self.init(4) }
+    internal static let right: ConstraintAttributes = ConstraintAttributes(UInt(1) << 2)
-    internal static var bottom: ConstraintAttributes { return self.init(8) }
+    internal static let bottom: ConstraintAttributes = ConstraintAttributes(UInt(1) << 3)
-    internal static var leading: ConstraintAttributes { return self.init(16) }
+    internal static let leading: ConstraintAttributes = ConstraintAttributes(UInt(1) << 4)
-    internal static var trailing: ConstraintAttributes { return self.init(32) }
+    internal static let trailing: ConstraintAttributes = ConstraintAttributes(UInt(1) << 5)
-    internal static var width: ConstraintAttributes { return self.init(64) }
+    internal static let width: ConstraintAttributes = ConstraintAttributes(UInt(1) << 6)
-    internal static var height: ConstraintAttributes { return self.init(128) }
+    internal static let height: ConstraintAttributes = ConstraintAttributes(UInt(1) << 7)
-    internal static var centerX: ConstraintAttributes { return self.init(256) }
+    internal static let centerX: ConstraintAttributes = ConstraintAttributes(UInt(1) << 8)
-    internal static var centerY: ConstraintAttributes { return self.init(512) }
+    internal static let centerY: ConstraintAttributes = ConstraintAttributes(UInt(1) << 9)
-    internal static var lastBaseline: ConstraintAttributes { return self.init(1024) }
+    internal static let lastBaseline: ConstraintAttributes = ConstraintAttributes(UInt(1) << 10)
    @available(iOS 8.0, OSX 10.11, *)
-    internal static var firstBaseline: ConstraintAttributes { return self.init(2048) }
+    internal static let firstBaseline: ConstraintAttributes = ConstraintAttributes(UInt(1) << 11)
-    
+
    @available(iOS 8.0, *)
-    internal static var leftMargin: ConstraintAttributes { return self.init(4096) }
+    internal static let leftMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 12)
-    
+
    @available(iOS 8.0, *)
-    internal static var rightMargin: ConstraintAttributes { return self.init(8192) }
+    internal static let rightMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 13)
-    
+
    @available(iOS 8.0, *)
-    internal static var topMargin: ConstraintAttributes { return self.init(16384) }
+    internal static let topMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 14)
-    
+
    @available(iOS 8.0, *)
-    internal static var bottomMargin: ConstraintAttributes { return self.init(32768) }
+    internal static let bottomMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 15)
-    
+
    @available(iOS 8.0, *)
-    internal static var leadingMargin: ConstraintAttributes { return self.init(65536) }
+    internal static let leadingMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 16)
-    
+
    @available(iOS 8.0, *)
-    internal static var trailingMargin: ConstraintAttributes { return self.init(131072) }
+    internal static let trailingMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 17)
-    
+
    @available(iOS 8.0, *)
-    internal static var centerXWithinMargins: ConstraintAttributes { return self.init(262144) }
+    internal static let centerXWithinMargins: ConstraintAttributes = ConstraintAttributes(UInt(1) << 18)
-    
+
    @available(iOS 8.0, *)
-    internal static var centerYWithinMargins: ConstraintAttributes { return self.init(524288) }
+    internal static let centerYWithinMargins: ConstraintAttributes = ConstraintAttributes(UInt(1) << 19)
    // aggregates
-    internal static var edges: ConstraintAttributes { return self.init(15) }
+    internal static let edges: ConstraintAttributes = [.horizontalEdges, .verticalEdges]
-    internal static var size: ConstraintAttributes { return self.init(192) }
+    internal static let horizontalEdges: ConstraintAttributes = [.left, .right]
-    internal static var center: ConstraintAttributes { return self.init(768) }
+    internal static let verticalEdges: ConstraintAttributes = [.top, .bottom]
-    
+    internal static let directionalEdges: ConstraintAttributes = [.directionalHorizontalEdges, .directionalVerticalEdges]
    internal static let directionalHorizontalEdges: ConstraintAttributes = [.leading, .trailing]
    internal static let directionalVerticalEdges: ConstraintAttributes = [.top, .bottom]
    internal static let size: ConstraintAttributes = [.width, .height]
    internal static let center: ConstraintAttributes = [.centerX, .centerY]
    @available(iOS 8.0, *)
-    internal static var margins: ConstraintAttributes { return self.init(61440) }
+    internal static let margins: ConstraintAttributes = [.leftMargin, .topMargin, .rightMargin, .bottomMargin]
-    
+
    @available(iOS 8.0, *)
-    internal static var centerWithinMargins: ConstraintAttributes { return self.init(786432) }
+    internal static let directionalMargins: ConstraintAttributes = [.leadingMargin, .topMargin, .trailingMargin, .bottomMargin]
    @available(iOS 8.0, *)
    internal static let centerWithinMargins: ConstraintAttributes = [.centerXWithinMargins, .centerYWithinMargins]
    internal var layoutAttributes:[LayoutAttribute] {
        var attrs = [LayoutAttribute]()
--- a/Sources/ConstraintConfig.swift
+++ b/Sources/ConstraintConfig.swift
--- a/Sources/ConstraintConstantTarget.swift
+++ b/Sources/ConstraintConstantTarget.swift
@ -40,6 +40,12 @@ extension CGSize: ConstraintConstantTarget {
 extension ConstraintInsets: ConstraintConstantTarget {
 }
 #if os(iOS) || os(tvOS)
@available(iOS 11.0, tvOS 11.0, *)
 extension ConstraintDirectionalInsets: ConstraintConstantTarget {
 }
 #endif
 extension ConstraintConstantTarget {
    internal func constraintConstantTargetValueFor(layoutAttribute: LayoutAttribute) -> CGFloat {
@ -82,7 +88,11 @@ extension ConstraintConstantTarget {
                    return value.y
                case .width, .height, .notAnAttribute:
                    return 0.0
-                }
+                #if swift(>=5.0)
                @unknown default:
                    return 0.0
                #endif
            }
            #else
                switch layoutAttribute {
                case .left, .right, .leading, .trailing, .centerX:
@ -91,56 +101,112 @@ extension ConstraintConstantTarget {
                    return value.y
                case .width, .height, .notAnAttribute:
                    return 0.0
-                }
+                #if swift(>=5.0)
                @unknown default:
                    return 0.0
                #endif
            }
            #endif
        }
        if let value = self as? ConstraintInsets {
            #if os(iOS) || os(tvOS)
                switch layoutAttribute {
-                case .left, .leftMargin, .centerX, .centerXWithinMargins:
+                case .left, .leftMargin:
                    return value.left
-                case .top, .topMargin, .centerY, .centerYWithinMargins, .lastBaseline, .firstBaseline:
+                case .top, .topMargin, .firstBaseline:
                    return value.top
                case .right, .rightMargin:
                    return -value.right
-                case .bottom, .bottomMargin:
+                case .bottom, .bottomMargin, .lastBaseline:
                    return -value.bottom
                case .leading, .leadingMargin:
                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
                case .trailing, .trailingMargin:
                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
                case .centerX, .centerXWithinMargins:
                    return (value.left - value.right) / 2
                case .centerY, .centerYWithinMargins:
                    return (value.top - value.bottom) / 2
                case .width:
                    return -(value.left + value.right)
                case .height:
                    return -(value.top + value.bottom)
                case .notAnAttribute:
                    return 0.0
-                }
+                #if swift(>=5.0)
                @unknown default:
                    return 0.0
                #endif
            }
            #else
                switch layoutAttribute {
-                case .left, .centerX:
+                case .left:
                    return value.left
-                case .top, .centerY, .lastBaseline, .firstBaseline:
+                case .top, .firstBaseline:
                    return value.top
                case .right:
                    return -value.right
-                case .bottom:
+                case .bottom, .lastBaseline:
                    return -value.bottom
                case .leading:
                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
                case .trailing:
                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
                case .centerX:
                    return (value.left - value.right) / 2
                case .centerY:
                    return (value.top - value.bottom) / 2
                case .width:
                    return -(value.left + value.right)
                case .height:
                    return -(value.top + value.bottom)
                case .notAnAttribute:
                    return 0.0
-                }
+                #if swift(>=5.0)
                @unknown default:
                    return 0.0
                #endif
            }
            #endif
        }
        #if os(iOS) || os(tvOS)
            if #available(iOS 11.0, tvOS 11.0, *), let value = self as? ConstraintDirectionalInsets {
                switch layoutAttribute {
                case .left, .leftMargin:
                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.leading : value.trailing
                case .top, .topMargin, .firstBaseline:
                    return value.top
                case .right, .rightMargin:
                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.trailing : -value.leading
                case .bottom, .bottomMargin, .lastBaseline:
                    return -value.bottom
                case .leading, .leadingMargin:
                    return value.leading
                case .trailing, .trailingMargin:
                    return -value.trailing
                case .centerX, .centerXWithinMargins:
                    return (value.leading - value.trailing) / 2
                case .centerY, .centerYWithinMargins:
                    return (value.top - value.bottom) / 2
                case .width:
                    return -(value.leading + value.trailing)
                case .height:
                    return -(value.top + value.bottom)
                case .notAnAttribute:
                    return 0.0
                #if swift(>=5.0)
                @unknown default:
                    return 0.0
                #else
                default:
                    return 0.0
                #endif
                }
            }
        #endif
        return 0.0
    }
--- a/Sources/ConstraintDSL.swift
+++ b/Sources/ConstraintDSL.swift
@ -99,6 +99,26 @@ extension ConstraintBasicAttributesDSL {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.edges)
    }
    public var directionalEdges: ConstraintItem {
      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalEdges)
    }
    public var horizontalEdges: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.horizontalEdges)
    }
    public var verticalEdges: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.verticalEdges)
    }
    public var directionalHorizontalEdges: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalHorizontalEdges)
    }
    public var directionalVerticalEdges: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalVerticalEdges)
    }
    public var size: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.size)
    }
@ -114,8 +134,7 @@ public protocol ConstraintAttributesDSL : ConstraintBasicAttributesDSL {
 extension ConstraintAttributesDSL {
    // MARK: Baselines
-    
+    @available(*, deprecated, renamed:"lastBaseline")
    @available(*, deprecated:3.0, message:"Use .lastBaseline instead")
    public var baseline: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.lastBaseline)
    }
@ -177,6 +196,11 @@ extension ConstraintAttributesDSL {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.margins)
    }
    @available(iOS 8.0, *)
    public var directionalMargins: ConstraintItem {
      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalMargins)
    }
    @available(iOS 8.0, *)
    public var centerWithinMargins: ConstraintItem {
        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerWithinMargins)
--- a/Sources/ConstraintDescription.swift
+++ b/Sources/ConstraintDescription.swift
--- a/Sources/ConstraintDirectionalInsetTarget.swift
+++ b/Sources/ConstraintDirectionalInsetTarget.swift
@ -0,0 +1,49 @@
 //
 //  SnapKit
 //
 //  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
 //  in the Software without restriction, including without limitation the rights
 //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 //  copies of the Software, and to permit persons to whom the Software is
 //  furnished to do so, subject to the following conditions:
 //
 //  The above copyright notice and this permission notice shall be included in
 //  all copies or substantial portions of the Software.
 //
 //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
 #if os(iOS) || os(tvOS)
 import UIKit
 #else
 import AppKit
 #endif
 #if os(iOS) || os(tvOS)
 public protocol ConstraintDirectionalInsetTarget: ConstraintConstantTarget {
 }
@available(iOS 11.0, tvOS 11.0, *)
 extension ConstraintDirectionalInsets: ConstraintDirectionalInsetTarget {
 }
 extension ConstraintDirectionalInsetTarget {
  @available(iOS 11.0, tvOS 11.0, *)
  internal var constraintDirectionalInsetTargetValue: ConstraintDirectionalInsets {
    if let amount = self as? ConstraintDirectionalInsets {
      return amount
    } else {
      return ConstraintDirectionalInsets(top: 0, leading: 0, bottom: 0, trailing: 0)
    }
  }
 }
 #endif
--- a/Sources/ConstraintDirectionalInsets.swift
+++ b/Sources/ConstraintDirectionalInsets.swift
@ -21,7 +21,14 @@
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
-#import <Foundation/Foundation.h>
+#if os(iOS) || os(tvOS)
    import UIKit
 #else
    import AppKit
 #endif
-FOUNDATION_EXPORT double SnapKitVersionNumber;
+
-FOUNDATION_EXPORT const unsigned char SnapKitVersionString[];
+#if os(iOS) || os(tvOS)
    @available(iOS 11.0, tvOS 11.0, *)
    public typealias ConstraintDirectionalInsets = NSDirectionalEdgeInsets
 #endif
--- a/Sources/ConstraintInsetTarget.swift
+++ b/Sources/ConstraintInsetTarget.swift
--- a/Sources/ConstraintInsets.swift
+++ b/Sources/ConstraintInsets.swift
--- a/Sources/ConstraintItem.swift
+++ b/Sources/ConstraintItem.swift
--- a/Sources/ConstraintLayoutGuide+Extensions.swift
+++ b/Sources/ConstraintLayoutGuide+Extensions.swift
@ -29,7 +29,7 @@
@available(iOS 9.0, OSX 10.11, *)
 public extension ConstraintLayoutGuide {
-    public var snp: ConstraintLayoutGuideDSL {
+    var snp: ConstraintLayoutGuideDSL {
        return ConstraintLayoutGuideDSL(guide: self)
    }
--- a/Sources/ConstraintLayoutGuide.swift
+++ b/Sources/ConstraintLayoutGuide.swift
--- a/Sources/ConstraintLayoutGuideDSL.swift
+++ b/Sources/ConstraintLayoutGuideDSL.swift
--- a/Sources/ConstraintLayoutSupport.swift
+++ b/Sources/ConstraintLayoutSupport.swift
--- a/Sources/ConstraintLayoutSupportDSL.swift
+++ b/Sources/ConstraintLayoutSupportDSL.swift
--- a/Sources/ConstraintMaker.swift
+++ b/Sources/ConstraintMaker.swift
@ -69,7 +69,7 @@ public class ConstraintMaker {
        return self.makeExtendableWithAttributes(.centerY)
    }
-    @available(*, deprecated:3.0, message:"Use lastBaseline instead")
+    @available(*, deprecated, renamed:"lastBaseline")
    public var baseline: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.lastBaseline)
    }
@ -126,6 +126,21 @@ public class ConstraintMaker {
    public var edges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.edges)
    }
    public var horizontalEdges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.horizontalEdges)
    }
    public var verticalEdges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.verticalEdges)
    }
    public var directionalEdges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.directionalEdges)
    }
    public var directionalHorizontalEdges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.directionalHorizontalEdges)
    }
    public var directionalVerticalEdges: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.directionalVerticalEdges)
    }
    public var size: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.size)
    }
@ -138,12 +153,17 @@ public class ConstraintMaker {
        return self.makeExtendableWithAttributes(.margins)
    }
    @available(iOS 8.0, *)
    public var directionalMargins: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.directionalMargins)
    }
    @available(iOS 8.0, *)
    public var centerWithinMargins: ConstraintMakerExtendable {
        return self.makeExtendableWithAttributes(.centerWithinMargins)
    }
-    private let item: LayoutConstraintItem
+    public let item: LayoutConstraintItem
    private var descriptions = [ConstraintDescription]()
    internal init(item: LayoutConstraintItem) {
@ -171,15 +191,7 @@ public class ConstraintMaker {
    }
    internal static func makeConstraints(item: LayoutConstraintItem, closure: (_ make: ConstraintMaker) -> Void) {
-        let maker = ConstraintMaker(item: item)
+        let constraints = prepareConstraints(item: item, closure: closure)
        closure(maker)
        var constraints: [Constraint] = []
        for description in maker.descriptions {
            guard let constraint = description.constraint else {
                continue
            }
            constraints.append(constraint)
        }
        for constraint in constraints {
            constraint.activateIfNeeded(updatingExisting: false)
        }
@ -196,15 +208,7 @@ public class ConstraintMaker {
            return
        }
-        let maker = ConstraintMaker(item: item)
+        let constraints = prepareConstraints(item: item, closure: closure)
        closure(maker)
        var constraints: [Constraint] = []
        for description in maker.descriptions {
            guard let constraint = description.constraint else {
                continue
            }
            constraints.append(constraint)
        }
        for constraint in constraints {
            constraint.activateIfNeeded(updatingExisting: true)
        }
--- a/Sources/ConstraintMakerEditable.swift
+++ b/Sources/ConstraintMakerEditable.swift
@ -28,7 +28,7 @@
 #endif
-public class ConstraintMakerEditable: ConstraintMakerPriortizable {
+public class ConstraintMakerEditable: ConstraintMakerPrioritizable {
    @discardableResult
    public func multipliedBy(_ amount: ConstraintMultiplierTarget) -> ConstraintMakerEditable {
@ -53,4 +53,12 @@ public class ConstraintMakerEditable: ConstraintMakerPriortizable {
        return self
    }
    #if os(iOS) || os(tvOS)
    @discardableResult
    @available(iOS 11.0, tvOS 11.0, *)
    public func inset(_ amount: ConstraintDirectionalInsetTarget) -> ConstraintMakerEditable {
        self.description.constant = amount.constraintDirectionalInsetTargetValue
        return self
    }
    #endif
 }
--- a/Sources/ConstraintMakerExtendable.swift
+++ b/Sources/ConstraintMakerExtendable.swift
@ -80,7 +80,7 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
        return self
    }
-    @available(*, deprecated:3.0, message:"Use lastBaseline instead")
+    @available(*, deprecated, renamed:"lastBaseline")
    public var baseline: ConstraintMakerExtendable {
        self.description.attributes += .lastBaseline
        return self
@ -149,6 +149,26 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
        self.description.attributes += .edges
        return self
    }
    public var horizontalEdges: ConstraintMakerExtendable {
        self.description.attributes += .horizontalEdges
        return self
    }
    public var verticalEdges: ConstraintMakerExtendable {
        self.description.attributes += .verticalEdges
        return self
    }
    public var directionalEdges: ConstraintMakerExtendable {
        self.description.attributes += .directionalEdges
        return self
    }
    public var directionalHorizontalEdges: ConstraintMakerExtendable {
        self.description.attributes += .directionalHorizontalEdges
        return self
    }
    public var directionalVerticalEdges: ConstraintMakerExtendable {
        self.description.attributes += .directionalVerticalEdges
        return self
    }
    public var size: ConstraintMakerExtendable {
        self.description.attributes += .size
        return self
@ -160,6 +180,12 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
        return self
    }
    @available(iOS 8.0, *)
    public var directionalMargins: ConstraintMakerExtendable {
      self.description.attributes += .directionalMargins
      return self
    }
    @available(iOS 8.0, *)
    public var centerWithinMargins: ConstraintMakerExtendable {
        self.description.attributes += .centerWithinMargins
--- a/Sources/ConstraintMakerFinalizable.swift
+++ b/Sources/ConstraintMakerFinalizable.swift
--- a/Sources/ConstraintMakerPrioritizable.swift
+++ b/Sources/ConstraintMakerPrioritizable.swift
@ -27,8 +27,10 @@
    import AppKit
 #endif
@available(*, deprecated, message:"Use ConstraintMakerPrioritizable instead.")
 public typealias ConstraintMakerPriortizable = ConstraintMakerPrioritizable
-public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
+public class ConstraintMakerPrioritizable: ConstraintMakerFinalizable {
    @discardableResult
    public func priority(_ amount: ConstraintPriority) -> ConstraintMakerFinalizable {
@ -42,25 +44,25 @@ public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
        return self
    }
-    @available(*, deprecated:3.0, message:"Use priority(.required) instead.")
+    @available(*, deprecated, message:"Use priority(.required) instead.")
    @discardableResult
    public func priorityRequired() -> ConstraintMakerFinalizable {
        return self.priority(.required)
    }
-    @available(*, deprecated:3.0, message:"Use priority(.high) instead.")
+    @available(*, deprecated, message:"Use priority(.high) instead.")
    @discardableResult
    public func priorityHigh() -> ConstraintMakerFinalizable {
        return self.priority(.high)
    }
-    @available(*, deprecated:3.0, message:"Use priority(.medium) instead.")
+    @available(*, deprecated, message:"Use priority(.medium) instead.")
    @discardableResult
    public func priorityMedium() -> ConstraintMakerFinalizable {
        return self.priority(.medium)
    }
-    @available(*, deprecated:3.0, message:"Use priority(.low) instead.")
+    @available(*, deprecated, message:"Use priority(.low) instead.")
    @discardableResult
    public func priorityLow() -> ConstraintMakerFinalizable {
        return self.priority(.low)
--- a/Sources/ConstraintMakerRelatable+Extensions.swift
+++ b/Sources/ConstraintMakerRelatable+Extensions.swift
@ -0,0 +1,57 @@
 //
 //  SnapKit
 //
 //  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
 //  in the Software without restriction, including without limitation the rights
 //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 //  copies of the Software, and to permit persons to whom the Software is
 //  furnished to do so, subject to the following conditions:
 //
 //  The above copyright notice and this permission notice shall be included in
 //  all copies or substantial portions of the Software.
 //
 //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
 #if os(iOS) || os(tvOS)
    import UIKit
 #else
    import AppKit
 #endif
 extension ConstraintMakerRelatable {
    @discardableResult
    public func equalToSuperview<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
        guard let other = self.description.item.superview else {
            fatalError("Expected superview but found nil when attempting make constraint `equalToSuperview`.")
        }
        return self.relatedTo(closure(other), relation: .equal, file: file, line: line)
    }
    @discardableResult
    public func lessThanOrEqualToSuperview<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
        guard let other = self.description.item.superview else {
            fatalError("Expected superview but found nil when attempting make constraint `lessThanOrEqualToSuperview`.")
        }
        return self.relatedTo(closure(other), relation: .lessThanOrEqual, file: file, line: line)
    }
    @discardableResult
    public func greaterThanOrEqualTo<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
        guard let other = self.description.item.superview else {
            fatalError("Expected superview but found nil when attempting make constraint `greaterThanOrEqualToSuperview`.")
        }
        return self.relatedTo(closure(other), relation: .greaterThanOrEqual, file: file, line: line)
    }
 }
--- a/Sources/ConstraintMakerRelatable.swift
+++ b/Sources/ConstraintMakerRelatable.swift
@ -45,7 +45,9 @@ public class ConstraintMakerRelatable {
                  other.attributes.layoutAttributes.count <= 1 ||
                  other.attributes.layoutAttributes == self.description.attributes.layoutAttributes ||
                  other.attributes == .edges && self.description.attributes == .margins ||
-                  other.attributes == .margins && self.description.attributes == .edges else {
+                  other.attributes == .margins && self.description.attributes == .edges ||
                  other.attributes == .directionalEdges && self.description.attributes == .directionalMargins ||
                  other.attributes == .directionalMargins && self.description.attributes == .directionalEdges else {
                fatalError("Cannot constraint to multiple non identical attributes. (\(file), \(line))");
            }
--- a/Sources/ConstraintMultiplierTarget.swift
+++ b/Sources/ConstraintMultiplierTarget.swift
--- a/Sources/ConstraintOffsetTarget.swift
+++ b/Sources/ConstraintOffsetTarget.swift
--- a/Sources/ConstraintPriority.swift
+++ b/Sources/ConstraintPriority.swift
--- a/Sources/ConstraintPriorityTarget.swift
+++ b/Sources/ConstraintPriorityTarget.swift
@ -73,3 +73,13 @@ extension CGFloat: ConstraintPriorityTarget {
    }
 }
 #if os(iOS) || os(tvOS)
 extension UILayoutPriority: ConstraintPriorityTarget {
    public var constraintPriorityTargetValue: Float {
        return self.rawValue
    }
 }
 #endif
--- a/Sources/ConstraintRelatableTarget.swift
+++ b/Sources/ConstraintRelatableTarget.swift
@ -55,6 +55,12 @@ extension CGPoint: ConstraintRelatableTarget {
 extension ConstraintInsets: ConstraintRelatableTarget {
 }
 #if os(iOS) || os(tvOS)
@available(iOS 11.0, tvOS 11.0, *)
 extension ConstraintDirectionalInsets: ConstraintRelatableTarget {
 }
 #endif
 extension ConstraintItem: ConstraintRelatableTarget {
 }
--- a/Sources/ConstraintRelation.swift
+++ b/Sources/ConstraintRelation.swift
--- a/Sources/ConstraintView+Extensions.swift
+++ b/Sources/ConstraintView+Extensions.swift
@ -0,0 +1,152 @@
 //
 //  SnapKit
 //
 //  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
 //  in the Software without restriction, including without limitation the rights
 //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 //  copies of the Software, and to permit persons to whom the Software is
 //  furnished to do so, subject to the following conditions:
 //
 //  The above copyright notice and this permission notice shall be included in
 //  all copies or substantial portions of the Software.
 //
 //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
 #if os(iOS) || os(tvOS)
    import UIKit
 #else
    import AppKit
 #endif
 public extension ConstraintView {
    @available(*, deprecated, renamed:"snp.left")
    var snp_left: ConstraintItem { return self.snp.left }
    @available(*, deprecated, renamed:"snp.top")
    var snp_top: ConstraintItem { return self.snp.top }
    @available(*, deprecated, renamed:"snp.right")
    var snp_right: ConstraintItem { return self.snp.right }
    @available(*, deprecated, renamed:"snp.bottom")
    var snp_bottom: ConstraintItem { return self.snp.bottom }
    @available(*, deprecated, renamed:"snp.leading")
    var snp_leading: ConstraintItem { return self.snp.leading }
    @available(*, deprecated, renamed:"snp.trailing")
    var snp_trailing: ConstraintItem { return self.snp.trailing }
    @available(*, deprecated, renamed:"snp.width")
    var snp_width: ConstraintItem { return self.snp.width }
    @available(*, deprecated, renamed:"snp.height")
    var snp_height: ConstraintItem { return self.snp.height }
    @available(*, deprecated, renamed:"snp.centerX")
    var snp_centerX: ConstraintItem { return self.snp.centerX }
    @available(*, deprecated, renamed:"snp.centerY")
    var snp_centerY: ConstraintItem { return self.snp.centerY }
    @available(*, deprecated, renamed:"snp.baseline")
    var snp_baseline: ConstraintItem { return self.snp.baseline }
    @available(*, deprecated, renamed:"snp.lastBaseline")
    @available(iOS 8.0, OSX 10.11, *)
    var snp_lastBaseline: ConstraintItem { return self.snp.lastBaseline }
    @available(iOS, deprecated, renamed:"snp.firstBaseline")
    @available(iOS 8.0, OSX 10.11, *)
    var snp_firstBaseline: ConstraintItem { return self.snp.firstBaseline }
    @available(iOS, deprecated, renamed:"snp.leftMargin")
    @available(iOS 8.0, *)
    var snp_leftMargin: ConstraintItem { return self.snp.leftMargin }
    @available(iOS, deprecated, renamed:"snp.topMargin")
    @available(iOS 8.0, *)
    var snp_topMargin: ConstraintItem { return self.snp.topMargin }
    @available(iOS, deprecated, renamed:"snp.rightMargin")
    @available(iOS 8.0, *)
    var snp_rightMargin: ConstraintItem { return self.snp.rightMargin }
    @available(iOS, deprecated, renamed:"snp.bottomMargin")
    @available(iOS 8.0, *)
    var snp_bottomMargin: ConstraintItem { return self.snp.bottomMargin }
    @available(iOS, deprecated, renamed:"snp.leadingMargin")
    @available(iOS 8.0, *)
    var snp_leadingMargin: ConstraintItem { return self.snp.leadingMargin }
    @available(iOS, deprecated, renamed:"snp.trailingMargin")
    @available(iOS 8.0, *)
    var snp_trailingMargin: ConstraintItem { return self.snp.trailingMargin }
    @available(iOS, deprecated, renamed:"snp.centerXWithinMargins")
    @available(iOS 8.0, *)
    var snp_centerXWithinMargins: ConstraintItem { return self.snp.centerXWithinMargins }
    @available(iOS, deprecated, renamed:"snp.centerYWithinMargins")
    @available(iOS 8.0, *)
    var snp_centerYWithinMargins: ConstraintItem { return self.snp.centerYWithinMargins }
    @available(*, deprecated, renamed:"snp.edges")
    var snp_edges: ConstraintItem { return self.snp.edges }
    @available(*, deprecated, renamed:"snp.size")
    var snp_size: ConstraintItem { return self.snp.size }
    @available(*, deprecated, renamed:"snp.center")
    var snp_center: ConstraintItem { return self.snp.center }
    @available(iOS, deprecated, renamed:"snp.margins")
    @available(iOS 8.0, *)
    var snp_margins: ConstraintItem { return self.snp.margins }
    @available(iOS, deprecated, renamed:"snp.centerWithinMargins")
    @available(iOS 8.0, *)
    var snp_centerWithinMargins: ConstraintItem { return self.snp.centerWithinMargins }
    @available(*, deprecated, renamed:"snp.prepareConstraints(_:)")
    func snp_prepareConstraints(_ closure: (_ make: ConstraintMaker) -> Void) -> [Constraint] {
        return self.snp.prepareConstraints(closure)
    }
    @available(*, deprecated, renamed:"snp.makeConstraints(_:)")
    func snp_makeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.makeConstraints(closure)
    }
    @available(*, deprecated, renamed:"snp.remakeConstraints(_:)")
    func snp_remakeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.remakeConstraints(closure)
    }
    @available(*, deprecated, renamed:"snp.updateConstraints(_:)")
    func snp_updateConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
        self.snp.updateConstraints(closure)
    }
    @available(*, deprecated, renamed:"snp.removeConstraints()")
    func snp_removeConstraints() {
        self.snp.removeConstraints()
    }
    var snp: ConstraintViewDSL {
        return ConstraintViewDSL(view: self)
    }
 }
--- a/Sources/ConstraintView.swift
+++ b/Sources/ConstraintView.swift
--- a/Sources/ConstraintViewDSL.swift
+++ b/Sources/ConstraintViewDSL.swift
@ -55,7 +55,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
        get {
            return self.view.contentHuggingPriority(for: .horizontal).rawValue
        }
-        set {
+        nonmutating set {
            self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .horizontal)
        }
    }
@ -64,7 +64,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
        get {
            return self.view.contentHuggingPriority(for: .vertical).rawValue
        }
-        set {
+        nonmutating set {
            self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .vertical)
        }
    }
@ -73,7 +73,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
        get {
            return self.view.contentCompressionResistancePriority(for: .horizontal).rawValue
        }
-        set {
+        nonmutating set {
            self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .horizontal)
        }
    }
@ -82,7 +82,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
        get {
            return self.view.contentCompressionResistancePriority(for: .vertical).rawValue
        }
-        set {
+        nonmutating set {
            self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .vertical)
        }
    }
--- a/Sources/Debugging.swift
+++ b/Sources/Debugging.swift
@ -29,7 +29,7 @@
 public extension LayoutConstraint {
-    override public var description: String {
+    override var description: String {
        var description = "<"
        description += descriptionForObject(self)
@ -82,6 +82,9 @@ private func descriptionForRelation(_ relation: LayoutRelation) -> String {
    case .equal:                return "=="
    case .greaterThanOrEqual:   return ">="
    case .lessThanOrEqual:      return "<="
    #if swift(>=5.0)
    @unknown default:           return "unknown"
    #endif
    }
 }
@ -109,7 +112,10 @@ private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
        case .trailingMargin:       return "trailingMargin"
        case .centerXWithinMargins: return "centerXWithinMargins"
        case .centerYWithinMargins: return "centerYWithinMargins"
-        }
+        #if swift(>=5.0)
        @unknown default:           return "unknown"
        #endif
    }
    #else
        switch attribute {
        case .notAnAttribute:       return "notAnAttribute"
@ -125,7 +131,10 @@ private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
        case .centerY:              return "centerY"
        case .lastBaseline:         return "lastBaseline"
        case .firstBaseline:        return "firstBaseline"
-        }
+        #if swift(>=5.0)
        @unknown default:           return "unknown"
        #endif
    }
    #endif
 }
--- a/Sources/LayoutConstraint.swift
+++ b/Sources/LayoutConstraint.swift
@ -44,13 +44,17 @@ public class LayoutConstraint : NSLayoutConstraint {
 }
 internal func ==(lhs: LayoutConstraint, rhs: LayoutConstraint) -> Bool {
-    guard lhs.firstItem === rhs.firstItem &&
+    // If firstItem or secondItem on either constraint has a dangling pointer
-          lhs.secondItem === rhs.secondItem &&
+    // this comparison can cause a crash. The solution for this is to ensure
-          lhs.firstAttribute == rhs.firstAttribute &&
+    // your layout code hold strong references to things like Views, LayoutGuides
    // and LayoutAnchors as SnapKit will not keep strong references to any of these.
    guard lhs.firstAttribute == rhs.firstAttribute &&
          lhs.secondAttribute == rhs.secondAttribute &&
          lhs.relation == rhs.relation &&
          lhs.priority == rhs.priority &&
-          lhs.multiplier == rhs.multiplier else {
+          lhs.multiplier == rhs.multiplier &&
          lhs.secondItem === rhs.secondItem &&
          lhs.firstItem === rhs.firstItem else {
        return false
    }
    return true
--- a/Sources/LayoutConstraintItem.swift
+++ b/Sources/LayoutConstraintItem.swift
@ -28,7 +28,7 @@
 #endif
-public protocol LayoutConstraintItem: class {
+public protocol LayoutConstraintItem: AnyObject {
 }
@available(iOS 9.0, OSX 10.11, *)
--- a/Sources/Typealiases.swift
+++ b/Sources/Typealiases.swift
@ -25,8 +25,13 @@ import Foundation
 #if os(iOS) || os(tvOS)
    import UIKit
 #if swift(>=4.2)
    typealias LayoutRelation = NSLayoutConstraint.Relation
    typealias LayoutAttribute = NSLayoutConstraint.Attribute
 #else
    typealias LayoutRelation = NSLayoutRelation
    typealias LayoutAttribute = NSLayoutAttribute
 #endif
    typealias LayoutPriority = UILayoutPriority
 #else
    import AppKit
--- a/Sources/UILayoutSupport+Extensions.swift
+++ b/Sources/UILayoutSupport+Extensions.swift
@ -29,7 +29,7 @@
@available(iOS 8.0, *)
 public extension ConstraintLayoutSupport {
-    public var snp: ConstraintLayoutSupportDSL {
+    var snp: ConstraintLayoutSupportDSL {
        return ConstraintLayoutSupportDSL(support: self)
    }
--- a/Source/Info.plist
+++ b/Source/Info.plist
--- a/Tests/SnapKitTests/Info.plist
+++ b/Tests/SnapKitTests/Info.plist
--- a/Tests/SnapKitTests/Tests.swift
+++ b/Tests/SnapKitTests/Tests.swift
@ -59,6 +59,46 @@ class SnapKitTests: XCTestCase {
        XCTAssertEqual(self.container.snp_constraints.count, 6, "Should have 6 constraints installed")
    }
    func testHorizontalVerticalEdges() {
        let v1 = View()
        self.container.addSubview(v1)
        v1.snp.makeConstraints { (make) -> Void in
            make.verticalEdges.equalToSuperview()
            make.horizontalEdges.equalToSuperview()
            return
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints installed")
        XCTAssertTrue(container.constraints.count == 4)
        XCTAssertTrue(container.constraints.allSatisfy { $0.firstItem === v1 && $0.secondItem === v1.superview })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .left && $0.secondAttribute == .left })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .right && $0.secondAttribute == .right })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .top && $0.secondAttribute == .top })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .bottom && $0.secondAttribute == .bottom })
    }
    func testHorizontalVerticalDirectionalEdges() {
        let v1 = View()
        self.container.addSubview(v1)
        v1.snp.makeConstraints { (make) -> Void in
            make.directionalVerticalEdges.equalToSuperview()
            make.directionalHorizontalEdges.equalToSuperview()
            return
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints installed")
        XCTAssertTrue(container.constraints.count == 4)
        XCTAssertTrue(container.constraints.allSatisfy { $0.firstItem === v1 && $0.secondItem === v1.superview })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .leading && $0.secondAttribute == .leading })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .trailing && $0.secondAttribute == .trailing })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .top && $0.secondAttribute == .top })
        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .bottom && $0.secondAttribute == .bottom })
    }
    func testGuideMakeConstraints() {
        guard #available(iOS 9.0, OSX 10.11, *) else { return }
@ -264,6 +304,40 @@ class SnapKitTests: XCTestCase {
    }
    func testSetIsActivatedConstraints() {
        let v1 = View()
        let v2 = View()
        self.container.addSubview(v1)
        self.container.addSubview(v2)
        var c1: Constraint? = nil
        var c2: Constraint? = nil
        v1.snp.prepareConstraints { (make) -> Void in
            c1 = make.top.equalTo(v2.snp.top).offset(50).constraint
            c2 = make.left.equalTo(v2.snp.top).offset(50).constraint
            return
        }
        XCTAssertEqual(self.container.snp_constraints.count, 0, "Should have 0 constraints")
        c1?.isActive = true
        c2?.isActive = false
        XCTAssertEqual(self.container.snp_constraints.count, 1, "Should have 1 constraint")
        c1?.isActive = true
        c2?.isActive = true
        XCTAssertEqual(self.container.snp_constraints.count, 2, "Should have 2 constraints")
        c1?.isActive = false
        c2?.isActive = false
        XCTAssertEqual(self.container.snp_constraints.count, 0, "Should have 0 constraints")
    }
    func testEdgeConstraints() {
        let view = View()
        self.container.addSubview(view)
@ -379,6 +453,90 @@ class SnapKitTests: XCTestCase {
        XCTAssertEqual(constraints[3].constant, -25, "Should be -25")
    }
    #if os(iOS) || os(tvOS)
    @available(iOS 11.0, tvOS 11.0, *)
    func testConstraintDirectionalInsetsAsImpliedEqualToConstraints() {
        let view = View()
        self.container.addSubview(view)
        view.snp.makeConstraints { (make) -> Void in
            make.top.leading.bottom.trailing.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
          XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
          XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
          XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
        }
        verify(constraints[0], .top, 25)
        verify(constraints[1], .bottom, -25)
        verify(constraints[2], .leading, 25)
        verify(constraints[3], .trailing, -25)
    }
    #endif
    #if os(iOS) || os(tvOS)
    @available(iOS 11.0, tvOS 11.0, *)
    func testConstraintDirectionalInsetsAsConstraintsConstant() {
        let view = View()
        self.container.addSubview(view)
        view.snp.makeConstraints { (make) -> Void in
            make.top.leading.bottom.trailing.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
            XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
            XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
            XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
        }
        verify(constraints[0], .top, 25)
        verify(constraints[1], .bottom, -25)
        verify(constraints[2], .leading, 25)
        verify(constraints[3], .trailing, -25)
    }
    #endif
    #if os(iOS) || os(tvOS)
    @available(iOS 11.0, tvOS 11.0, *)
    func testConstraintDirectionalInsetsFallBackForNonDirectionalConstraints() {
        let view = View()
        self.container.addSubview(view)
        view.snp.makeConstraints { (make) -> Void in
            make.edges.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
            XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
            XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
            XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
        }
        verify(constraints[0], .left, 25)
        verify(constraints[1], .right, -25)
        verify(constraints[2], .top, 25)
        verify(constraints[3], .bottom, -25)
    }
    #endif
    func testSizeConstraints() {
        let view = View()
        self.container.addSubview(view)
@ -457,11 +615,33 @@ class SnapKitTests: XCTestCase {
        XCTAssert(fromAttributes == [.top, .left, .bottom, .right])
        XCTAssert(toAttributes == [.top, .left, .bottom, .right])
    }
    func testDirectionalEdgesToDirectionalEdges() {
        var fromAttributes = Set<LayoutAttribute>()
        var toAttributes = Set<LayoutAttribute>()
        let view = View()
        self.container.addSubview(view)
        view.snp.remakeConstraints { (make) -> Void in
            make.directionalEdges.equalTo(self.container.snp.directionalEdges)
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
            fromAttributes.insert(constraint.firstAttribute)
            toAttributes.insert(constraint.secondAttribute)
        }
        XCTAssert(fromAttributes == [.top, .leading, .bottom, .trailing])
        XCTAssert(toAttributes == [.top, .leading, .bottom, .trailing])
    }
    #if os(iOS) || os(tvOS)
    func testEdgesToMargins() {
-        var fromAttributes = Set<NSLayoutAttribute>()
+        var fromAttributes = Set<LayoutAttribute>()
-        var toAttributes = Set<NSLayoutAttribute>()
+        var toAttributes = Set<LayoutAttribute>()
        let view = View()
        self.container.addSubview(view)
@ -498,6 +678,46 @@ class SnapKitTests: XCTestCase {
        XCTAssert(fromAttributes == [.topMargin, .leftMargin, .bottomMargin, .rightMargin])
    }
    func testDirectionalEdgesToDirectionalMargins() {
        var fromAttributes = Set<LayoutAttribute>()
        var toAttributes = Set<LayoutAttribute>()
        let view = View()
        self.container.addSubview(view)
        view.snp.remakeConstraints { (make) -> Void in
            make.directionalEdges.equalTo(self.container.snp.directionalMargins)
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
            fromAttributes.insert(constraint.firstAttribute)
            toAttributes.insert(constraint.secondAttribute)
        }
        XCTAssert(fromAttributes == [.top, .leading, .bottom, .trailing])
        XCTAssert(toAttributes == [.topMargin, .leadingMargin, .bottomMargin, .trailingMargin])
        fromAttributes.removeAll()
        toAttributes.removeAll()
        view.snp.remakeConstraints { (make) -> Void in
            make.directionalMargins.equalTo(self.container.snp.directionalEdges)
        }
        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
            fromAttributes.insert(constraint.firstAttribute)
            toAttributes.insert(constraint.secondAttribute)
        }
        XCTAssert(toAttributes == [.top, .leading, .bottom, .trailing])
        XCTAssert(fromAttributes == [.topMargin, .leadingMargin, .bottomMargin, .trailingMargin])
    }
    func testLayoutGuideConstraints() {
        let vc = UIViewController()
@ -516,6 +736,8 @@ class SnapKitTests: XCTestCase {
    func testCanSetLabel() {
        self.container.snp.setLabel("Hello World")
        XCTAssertEqual(self.container.snp.label(), "Hello World")
    }
    func testPriorityShortcuts() {