Xcode 4 mac compatibility (#446)

* Typealias the types that are different on mac and ios
Update tests because when failing they where being blocked and stoped running

* try xcode 9 version to see tests pass

* Renaming the Typealiases to remove Generic suffix and NS prefix

.travis.yml

@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode8
+osx_image: xcode9
 
 env:
   - ACTION=test  PLATFORM=Mac     DESTINATION='platform=OS X'

SnapKit.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		2DBA080E1F1FAD66001CFED4 /* Typealiases.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */; };
 		EE235F5F1C5785BC00C08960 /* Debugging.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F5E1C5785BC00C08960 /* Debugging.swift */; };
 		EE235F6D1C5785C600C08960 /* Constraint.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F621C5785C600C08960 /* Constraint.swift */; };
 		EE235F701C5785C600C08960 /* ConstraintDescription.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F631C5785C600C08960 /* ConstraintDescription.swift */; };
@@ -46,6 +47,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Typealiases.swift; sourceTree = "<group>"; };
 		537DCE9A1C35CD4100B5B899 /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS9.1.sdk/System/Library/Frameworks/UIKit.framework; sourceTree = DEVELOPER_DIR; };
 		EE235F5E1C5785BC00C08960 /* Debugging.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Debugging.swift; sourceTree = "<group>"; };
 		EE235F621C5785C600C08960 /* Constraint.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Constraint.swift; sourceTree = "<group>"; };
@@ -178,6 +180,7 @@
 			isa = PBXGroup;
 			children = (
 				EE235F621C5785C600C08960 /* Constraint.swift */,
+				2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */,
 				EE235F631C5785C600C08960 /* ConstraintDescription.swift */,
 				EE235F641C5785C600C08960 /* ConstraintInsets.swift */,
 				EE235F651C5785C600C08960 /* ConstraintConfig.swift */,
@@ -373,6 +376,7 @@
 				EEF68FA61D784A5300980C26 /* ConstraintDSL.swift in Sources */,
 				EE235FBB1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */,
 				EE235F881C5785C600C08960 /* ConstraintItem.swift in Sources */,
+				2DBA080E1F1FAD66001CFED4 /* Typealiases.swift in Sources */,
 				EE235F9A1C5785CE00C08960 /* ConstraintPriorityTarget.swift in Sources */,
 				EEF68FC01D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */,
 				EEF68FB01D784FB100980C26 /* ConstraintLayoutGuide+Extensions.swift in Sources */,

Source/Constraint.swift

@@ -89,7 +89,7 @@ public final class Constraint {
 
         for layoutFromAttribute in layoutFromAttributes {
             // get layout to attribute
-            let layoutToAttribute: NSLayoutAttribute
+            let layoutToAttribute: LayoutAttribute
             #if os(iOS) || os(tvOS)
                 if layoutToAttributes.count > 0 {
                     if self.from.attributes == .edges && self.to.attributes == .margins {
@@ -166,7 +166,7 @@ public final class Constraint {
             layoutConstraint.label = self.label
 
             // set priority
-            layoutConstraint.priority = UILayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
+            layoutConstraint.priority = LayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
 
             // set constraint
             layoutConstraint.constraint = self
@@ -244,7 +244,7 @@ public final class Constraint {
 
             let requiredPriority = ConstraintPriority.required.value
             if (layoutConstraint.priority.rawValue < requiredPriority), (self.priority.constraintPriorityTargetValue != requiredPriority) {
-                layoutConstraint.priority = UILayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
+                layoutConstraint.priority = LayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
             }
         }
     }

Source/ConstraintAttributes.swift

@@ -103,8 +103,8 @@ internal struct ConstraintAttributes : OptionSet {
     @available(iOS 8.0, *)
     internal static var centerWithinMargins: ConstraintAttributes { return self.init(786432) }
     
-    internal var layoutAttributes:[NSLayoutAttribute] {
+    internal var layoutAttributes:[LayoutAttribute] {
-        var attrs = [NSLayoutAttribute]()
+        var attrs = [LayoutAttribute]()
         if (self.contains(ConstraintAttributes.left)) {
             attrs.append(.left)
         }

Source/ConstraintConstantTarget.swift

@@ -42,7 +42,7 @@ extension ConstraintInsets: ConstraintConstantTarget {
 
 extension ConstraintConstantTarget {
     
-    internal func constraintConstantTargetValueFor(layoutAttribute: NSLayoutAttribute) -> CGFloat {
+    internal func constraintConstantTargetValueFor(layoutAttribute: LayoutAttribute) -> CGFloat {
         if let value = self as? CGFloat {
             return value
         }

Source/ConstraintInsets.swift

@@ -31,5 +31,5 @@
 #if os(iOS) || os(tvOS)
     public typealias ConstraintInsets = UIEdgeInsets
 #else
-    public typealias ConstraintInsets = EdgeInsets
+    public typealias ConstraintInsets = NSEdgeInsets
 #endif

Source/ConstraintRelation.swift

@@ -33,7 +33,7 @@ internal enum ConstraintRelation : Int {
     case lessThanOrEqual
     case greaterThanOrEqual
     
-    internal var layoutRelation: NSLayoutRelation {
+    internal var layoutRelation: LayoutRelation {
         get {
             switch(self) {
             case .equal:

Source/ConstraintViewDSL.swift

@@ -56,7 +56,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
             return self.view.contentHuggingPriority(for: .horizontal).rawValue
         }
         set {
-            self.view.setContentHuggingPriority(UILayoutPriority(rawValue: newValue), for: .horizontal)
+            self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .horizontal)
         }
     }
     
@@ -65,7 +65,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
             return self.view.contentHuggingPriority(for: .vertical).rawValue
         }
         set {
-            self.view.setContentHuggingPriority(UILayoutPriority(rawValue: newValue), for: .vertical)
+            self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .vertical)
         }
     }
     
@@ -74,7 +74,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
             return self.view.contentCompressionResistancePriority(for: .horizontal).rawValue
         }
         set {
-            self.view.setContentCompressionResistancePriority(UILayoutPriority(rawValue: newValue), for: .horizontal)
+            self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .horizontal)
         }
     }
     
@@ -83,7 +83,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
             return self.view.contentCompressionResistancePriority(for: .vertical).rawValue
         }
         set {
-            self.view.setContentCompressionResistancePriority(UILayoutPriority(rawValue: newValue), for: .vertical)
+            self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .vertical)
         }
     }
     

Source/Debugging.swift

@@ -77,7 +77,7 @@ public extension LayoutConstraint {
     
 }
 
-private func descriptionForRelation(_ relation: NSLayoutRelation) -> String {
+private func descriptionForRelation(_ relation: LayoutRelation) -> String {
     switch relation {
     case .equal:                return "=="
     case .greaterThanOrEqual:   return ">="
@@ -85,7 +85,7 @@ private func descriptionForRelation(_ relation: NSLayoutRelation) -> String {
     }
 }
 
-private func descriptionForAttribute(_ attribute: NSLayoutAttribute) -> String {
+private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
     #if os(iOS) || os(tvOS)
         switch attribute {
         case .notAnAttribute:       return "notAnAttribute"

Source/Typealiases.swift

@@ -0,0 +1,22 @@
+//
+//  Typealiases.swift
+//  SnapKit
+//
+//  Created by Raimon Lapuente on 19/07/2017.
+//  Copyright © 2017 SnapKit Team. All rights reserved.
+//
+
+import Foundation
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+    typealias LayoutRelation = NSLayoutRelation
+    typealias LayoutAttribute = NSLayoutAttribute
+    typealias LayoutPriority = UILayoutPriority
+#else
+    import AppKit
+    typealias LayoutRelation = NSLayoutConstraint.Relation
+    typealias LayoutAttribute = NSLayoutConstraint.Attribute
+    typealias LayoutPriority = NSLayoutConstraint.Priority
+#endif
+

Tests/Tests.swift

@@ -395,7 +395,7 @@ class SnapKitTests: XCTestCase {
         let constraints = view.snp_constraints as! [NSLayoutConstraint]
 
         // no guarantee which order the constraints are in, but we should test their couple
-        let widthHeight = (NSLayoutAttribute.width.rawValue, NSLayoutAttribute.height.rawValue)
+        let widthHeight = (LayoutAttribute.width.rawValue, LayoutAttribute.height.rawValue)
         let heightWidth = (widthHeight.1, widthHeight.0)
         let firstSecond = (constraints[0].firstAttribute.rawValue, constraints[1].firstAttribute.rawValue)
 
@@ -416,10 +416,11 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(self.container.snp_constraints.count, 2, "Should have 2 constraints")
         
         
-        let constraints = self.container.snp_constraints as! [NSLayoutConstraint]
+        if let constraints = self.container.snp_constraints as? [NSLayoutConstraint], constraints.count > 0 {
         
-        XCTAssertEqual(constraints[0].constant, 50, "Should be 50")
+            XCTAssertEqual(constraints[0].constant, 50, "Should be 50")
-        XCTAssertEqual(constraints[1].constant, 50, "Should be 50")
+            XCTAssertEqual(constraints[1].constant, 50, "Should be 50")
+        }
     }
     
     func testConstraintIdentifier() {
@@ -436,8 +437,8 @@ class SnapKitTests: XCTestCase {
     }
     
     func testEdgesToEdges() {
-        var fromAttributes = Set<NSLayoutAttribute>()
+        var fromAttributes = Set<LayoutAttribute>()
-        var toAttributes = Set<NSLayoutAttribute>()
+        var toAttributes = Set<LayoutAttribute>()
         
         let view = View()
         self.container.addSubview(view)