Merge branch 'develop' of github.com:SnapKit/SnapKit into develop

.gitignore

@@ -1,3 +1,4 @@
+.build/
 project.xcworkspace
 xcuserdata
 Examples/

Package.swift

@@ -1,3 +1,4 @@
+// swift-tools-version:4.0
 //
 //  SnapKit
 //
@@ -25,5 +26,12 @@
 import PackageDescription
 
 let package = Package(
-    name: "SnapKit"
+    name: "SnapKit",
+    products: [
+        .library(name: "SnapKit", targets: ["SnapKit"]),
+    ],
+    targets: [
+        .target(name: "SnapKit", path: "Source"),
+        .testTarget(name: "SnapKitTests", dependencies: ["SnapKit"]),
+    ]
 )

SnapKit.xcodeproj/project.pbxproj

@@ -82,8 +82,8 @@
 		EEBCC9E219CC627E0083B827 /* SnapKit Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "SnapKit Tests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
 		EECDB3641AC0C95C006BBC11 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		EECDB3661AC0C95C006BBC11 /* SnapKit.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SnapKit.h; sourceTree = "<group>"; };
-		EECDB3691AC0C95C006BBC11 /* 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>"; };
-		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Tests.swift; sourceTree = "<group>"; };
+		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Tests.swift; path = SnapKitTests/Tests.swift; sourceTree = "<group>"; };
 		EEF68F9D1D78492400980C26 /* ConstraintLayoutGuideDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintLayoutGuideDSL.swift; sourceTree = "<group>"; };
 		EEF68FA51D784A5300980C26 /* ConstraintDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintDSL.swift; sourceTree = "<group>"; };
 		EEF68FAF1D784FB100980C26 /* ConstraintLayoutGuide+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "ConstraintLayoutGuide+Extensions.swift"; sourceTree = "<group>"; };
@@ -559,7 +559,7 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -572,7 +572,7 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";

Source/Constraint.swift

@@ -49,6 +49,16 @@ public final class Constraint {
     public var layoutConstraints: [LayoutConstraint]
     
     public var isActive: Bool {
+        set {
+            if newValue {
+                activate()
+            }
+            else {
+                deactivate()
+            }
+        }
+        
+        get {
             for layoutConstraint in self.layoutConstraints {
                 if layoutConstraint.isActive {
                     return true
@@ -56,6 +66,7 @@ public final class Constraint {
             }
             return false
         }
+    }
     
     // MARK: Initialization
 
@@ -214,6 +225,12 @@ public final class Constraint {
         return self
     }
 
+    @discardableResult
+    public func update(priority: ConstraintPriority) -> Constraint {
+        self.priority = priority.value
+        return self
+    }
+
     @available(*, deprecated:3.0, message:"Use update(offset: ConstraintOffsetTarget) instead.")
     public func updateOffset(amount: ConstraintOffsetTarget) -> Void { self.update(offset: amount) }
 

Source/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 +56,57 @@ internal struct ConstraintAttributes : OptionSet {
     
     // normal
     
-    internal static var none: ConstraintAttributes { return self.init(0) }
+    internal static var none: ConstraintAttributes { return 0 }
-    internal static var left: ConstraintAttributes { return self.init(1) }
+    internal static var left: ConstraintAttributes { return 1 }
-    internal static var top: ConstraintAttributes {  return self.init(2) }
+    internal static var top: ConstraintAttributes {  return 2 }
-    internal static var right: ConstraintAttributes { return self.init(4) }
+    internal static var right: ConstraintAttributes { return 4 }
-    internal static var bottom: ConstraintAttributes { return self.init(8) }
+    internal static var bottom: ConstraintAttributes { return 8 }
-    internal static var leading: ConstraintAttributes { return self.init(16) }
+    internal static var leading: ConstraintAttributes { return 16 }
-    internal static var trailing: ConstraintAttributes { return self.init(32) }
+    internal static var trailing: ConstraintAttributes { return 32 }
-    internal static var width: ConstraintAttributes { return self.init(64) }
+    internal static var width: ConstraintAttributes { return 64 }
-    internal static var height: ConstraintAttributes { return self.init(128) }
+    internal static var height: ConstraintAttributes { return 128 }
-    internal static var centerX: ConstraintAttributes { return self.init(256) }
+    internal static var centerX: ConstraintAttributes { return 256 }
-    internal static var centerY: ConstraintAttributes { return self.init(512) }
+    internal static var centerY: ConstraintAttributes { return 512 }
-    internal static var lastBaseline: ConstraintAttributes { return self.init(1024) }
+    internal static var lastBaseline: ConstraintAttributes { return 1024 }
     
     @available(iOS 8.0, OSX 10.11, *)
-    internal static var firstBaseline: ConstraintAttributes { return self.init(2048) }
+    internal static var firstBaseline: ConstraintAttributes { return 2048 }
     
     @available(iOS 8.0, *)
-    internal static var leftMargin: ConstraintAttributes { return self.init(4096) }
+    internal static var leftMargin: ConstraintAttributes { return 4096 }
     
     @available(iOS 8.0, *)
-    internal static var rightMargin: ConstraintAttributes { return self.init(8192) }
+    internal static var rightMargin: ConstraintAttributes { return 8192 }
     
     @available(iOS 8.0, *)
-    internal static var topMargin: ConstraintAttributes { return self.init(16384) }
+    internal static var topMargin: ConstraintAttributes { return 16384 }
     
     @available(iOS 8.0, *)
-    internal static var bottomMargin: ConstraintAttributes { return self.init(32768) }
+    internal static var bottomMargin: ConstraintAttributes { return 32768 }
     
     @available(iOS 8.0, *)
-    internal static var leadingMargin: ConstraintAttributes { return self.init(65536) }
+    internal static var leadingMargin: ConstraintAttributes { return 65536 }
     
     @available(iOS 8.0, *)
-    internal static var trailingMargin: ConstraintAttributes { return self.init(131072) }
+    internal static var trailingMargin: ConstraintAttributes { return 131072 }
     
     @available(iOS 8.0, *)
-    internal static var centerXWithinMargins: ConstraintAttributes { return self.init(262144) }
+    internal static var centerXWithinMargins: ConstraintAttributes { return 262144 }
     
     @available(iOS 8.0, *)
-    internal static var centerYWithinMargins: ConstraintAttributes { return self.init(524288) }
+    internal static var centerYWithinMargins: ConstraintAttributes { return 524288 }
     
     // aggregates
     
-    internal static var edges: ConstraintAttributes { return self.init(15) }
+    internal static var edges: ConstraintAttributes { return 15 }
-    internal static var size: ConstraintAttributes { return self.init(192) }
+    internal static var size: ConstraintAttributes { return 192 }
-    internal static var center: ConstraintAttributes { return self.init(768) }
+    internal static var center: ConstraintAttributes { return 768 }
     
     @available(iOS 8.0, *)
-    internal static var margins: ConstraintAttributes { return self.init(61440) }
+    internal static var margins: ConstraintAttributes { return 61440 }
     
     @available(iOS 8.0, *)
-    internal static var centerWithinMargins: ConstraintAttributes { return self.init(786432) }
+    internal static var centerWithinMargins: ConstraintAttributes { return 786432 }
     
     internal var layoutAttributes:[LayoutAttribute] {
         var attrs = [LayoutAttribute]()

Source/ConstraintMaker.swift

@@ -171,15 +171,7 @@ 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 +188,7 @@ 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)
         }

Source/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

Source/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

Tests/SnapKitTests/Tests.swift

@@ -264,6 +264,40 @@ 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)