Tweaks for OSX support

SnapKit.xcodeproj/project.pbxproj

@@ -80,9 +80,9 @@
 		EE235FC01C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */; };
 		EE235FC11C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */; };
 		EE235FC21C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */; };
-		EE235FC31C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* UILayoutSupportDSL.swift */; };
+		EE235FC31C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */; };
-		EE235FC41C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* UILayoutSupportDSL.swift */; };
+		EE235FC41C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */; };
-		EE235FC51C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* UILayoutSupportDSL.swift */; };
+		EE235FC51C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */; };
 		EE235FC81C5785E200C08960 /* ConstraintView+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */; };
 		EE235FC91C5785E200C08960 /* ConstraintView+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */; };
 		EE235FCA1C5785E200C08960 /* ConstraintView+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */; };
@@ -94,10 +94,10 @@
 		EECDB3931AC0CB52006BBC11 /* Tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = EECDB36A1AC0C95C006BBC11 /* Tests.swift */; };
 		EECDB3941AC0CB52006BBC11 /* Tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = EECDB36A1AC0C95C006BBC11 /* Tests.swift */; };
 		EECDB39D1AC0CC03006BBC11 /* SnapKit.h in Headers */ = {isa = PBXBuildFile; fileRef = EECDB3661AC0C95C006BBC11 /* SnapKit.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		EEF68F9E1D78492400980C26 /* UILayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* UILayoutGuideDSL.swift */; };
+		EEF68F9E1D78492400980C26 /* ConstraintLayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* ConstraintLayoutGuideDSL.swift */; };
 		EEF68FA61D784A5300980C26 /* ConstraintDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FA51D784A5300980C26 /* ConstraintDSL.swift */; };
-		EEF68FAB1D784E3800980C26 /* UILayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* UILayoutGuideDSL.swift */; };
+		EEF68FAB1D784E3800980C26 /* ConstraintLayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* ConstraintLayoutGuideDSL.swift */; };
-		EEF68FAC1D784E3800980C26 /* UILayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* UILayoutGuideDSL.swift */; };
+		EEF68FAC1D784E3800980C26 /* ConstraintLayoutGuideDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68F9D1D78492400980C26 /* ConstraintLayoutGuideDSL.swift */; };
 		EEF68FAD1D784E3A00980C26 /* ConstraintDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FA51D784A5300980C26 /* ConstraintDSL.swift */; };
 		EEF68FAE1D784E3B00980C26 /* ConstraintDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FA51D784A5300980C26 /* ConstraintDSL.swift */; };
 		EEF68FB01D784FB100980C26 /* UILayoutGuide+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FAF1D784FB100980C26 /* UILayoutGuide+Extensions.swift */; };
@@ -106,6 +106,12 @@
 		EEF68FB41D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FB31D784FBA00980C26 /* UILayoutSupport+Extensions.swift */; };
 		EEF68FB51D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FB31D784FBA00980C26 /* UILayoutSupport+Extensions.swift */; };
 		EEF68FB61D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FB31D784FBA00980C26 /* UILayoutSupport+Extensions.swift */; };
+		EEF68FBC1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */; };
+		EEF68FBD1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */; };
+		EEF68FBE1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */; };
+		EEF68FC01D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBF1D7865AA00980C26 /* ConstraintLayoutSupport.swift */; };
+		EEF68FC11D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBF1D7865AA00980C26 /* ConstraintLayoutSupport.swift */; };
+		EEF68FC21D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */ = {isa = PBXBuildFile; fileRef = EEF68FBF1D7865AA00980C26 /* ConstraintLayoutSupport.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -145,7 +151,7 @@
 		EE235FAA1C5785D400C08960 /* ConstraintMakerRelatable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMakerRelatable.swift; sourceTree = "<group>"; };
 		EE235FAB1C5785D400C08960 /* ConstraintMakerExtendable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMakerExtendable.swift; sourceTree = "<group>"; };
 		EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintViewDSL.swift; sourceTree = "<group>"; };
-		EE235FBF1C5785DC00C08960 /* UILayoutSupportDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UILayoutSupportDSL.swift; sourceTree = "<group>"; };
+		EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintLayoutSupportDSL.swift; sourceTree = "<group>"; };
 		EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "ConstraintView+Extensions.swift"; sourceTree = "<group>"; };
 		EE94F6081AC0F10A008767FF /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
 		EE94F60A1AC0F10F008767FF /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/AppKit.framework; sourceTree = DEVELOPER_DIR; };
@@ -157,10 +163,12 @@
 		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Tests.swift; sourceTree = "<group>"; };
 		EECDB37A1AC0C9D4006BBC11 /* SnapKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SnapKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		EECDB3841AC0C9D4006BBC11 /* SnapKit OSX Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "SnapKit OSX Tests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
-		EEF68F9D1D78492400980C26 /* UILayoutGuideDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UILayoutGuideDSL.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 /* UILayoutGuide+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UILayoutGuide+Extensions.swift"; sourceTree = "<group>"; };
 		EEF68FB31D784FBA00980C26 /* UILayoutSupport+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UILayoutSupport+Extensions.swift"; sourceTree = "<group>"; };
+		EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintLayoutGuide.swift; sourceTree = "<group>"; };
+		EEF68FBF1D7865AA00980C26 /* ConstraintLayoutSupport.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintLayoutSupport.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -252,8 +260,8 @@
 			children = (
 				EEF68FA51D784A5300980C26 /* ConstraintDSL.swift */,
 				EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */,
-				EEF68F9D1D78492400980C26 /* UILayoutGuideDSL.swift */,
+				EEF68F9D1D78492400980C26 /* ConstraintLayoutGuideDSL.swift */,
-				EE235FBF1C5785DC00C08960 /* UILayoutSupportDSL.swift */,
+				EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */,
 			);
 			name = DSLs;
 			sourceTree = "<group>";
@@ -292,6 +300,8 @@
 				EE235F641C5785C600C08960 /* ConstraintInsets.swift */,
 				EE235F651C5785C600C08960 /* ConstraintConfig.swift */,
 				EE235F661C5785C600C08960 /* ConstraintView.swift */,
+				EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */,
+				EEF68FBF1D7865AA00980C26 /* ConstraintLayoutSupport.swift */,
 				EE235F681C5785C600C08960 /* ConstraintRelation.swift */,
 				EE235F6A1C5785C600C08960 /* ConstraintAttributes.swift */,
 				EE235F6B1C5785C600C08960 /* ConstraintItem.swift */,
@@ -602,14 +612,16 @@
 				EE235FB91C5785D400C08960 /* ConstraintMakerRelatable.swift in Sources */,
 				EE235F861C5785C600C08960 /* ConstraintAttributes.swift in Sources */,
 				EE235FA11C5785CE00C08960 /* ConstraintOffsetTarget.swift in Sources */,
-				EEF68FAB1D784E3800980C26 /* UILayoutGuideDSL.swift in Sources */,
+				EEF68FAB1D784E3800980C26 /* ConstraintLayoutGuideDSL.swift in Sources */,
 				EE235FB61C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */,
+				EEF68FBD1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAD1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
 				EE235F951C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
 				EE235FBC1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */,
 				EEF68FAD1D784E3A00980C26 /* ConstraintDSL.swift in Sources */,
 				EE235F891C5785C600C08960 /* ConstraintItem.swift in Sources */,
 				EE235F9B1C5785CE00C08960 /* ConstraintPriorityTarget.swift in Sources */,
+				EEF68FC11D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */,
 				EEF68FB11D784FB100980C26 /* UILayoutGuide+Extensions.swift in Sources */,
 				EE235F771C5785C600C08960 /* ConstraintConfig.swift in Sources */,
 				EE235F6E1C5785C600C08960 /* Constraint.swift in Sources */,
@@ -620,7 +632,7 @@
 				EE235F9E1C5785CE00C08960 /* ConstraintMultiplierTarget.swift in Sources */,
 				EE235FC11C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */,
 				EE235F601C5785BC00C08960 /* Debugging.swift in Sources */,
-				EE235FC41C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */,
+				EE235FC41C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */,
 				EE235F801C5785C600C08960 /* ConstraintRelation.swift in Sources */,
 				EEF68FB51D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */,
 				EE235F711C5785C600C08960 /* ConstraintDescription.swift in Sources */,
@@ -646,14 +658,16 @@
 				EE235FB81C5785D400C08960 /* ConstraintMakerRelatable.swift in Sources */,
 				EE235F851C5785C600C08960 /* ConstraintAttributes.swift in Sources */,
 				EE235FA01C5785CE00C08960 /* ConstraintOffsetTarget.swift in Sources */,
-				EEF68F9E1D78492400980C26 /* UILayoutGuideDSL.swift in Sources */,
+				EEF68F9E1D78492400980C26 /* ConstraintLayoutGuideDSL.swift in Sources */,
 				EE235FB51C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */,
+				EEF68FBC1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAC1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
 				EE235F941C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
 				EEF68FA61D784A5300980C26 /* ConstraintDSL.swift in Sources */,
 				EE235FBB1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */,
 				EE235F881C5785C600C08960 /* ConstraintItem.swift in Sources */,
 				EE235F9A1C5785CE00C08960 /* ConstraintPriorityTarget.swift in Sources */,
+				EEF68FC01D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */,
 				EEF68FB01D784FB100980C26 /* UILayoutGuide+Extensions.swift in Sources */,
 				EE235F761C5785C600C08960 /* ConstraintConfig.swift in Sources */,
 				EE235F6D1C5785C600C08960 /* Constraint.swift in Sources */,
@@ -664,7 +678,7 @@
 				EE235F9D1C5785CE00C08960 /* ConstraintMultiplierTarget.swift in Sources */,
 				EE235FC01C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */,
 				EE235F5F1C5785BC00C08960 /* Debugging.swift in Sources */,
-				EE235FC31C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */,
+				EE235FC31C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */,
 				EE235F7F1C5785C600C08960 /* ConstraintRelation.swift in Sources */,
 				EEF68FB41D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */,
 				EE235F701C5785C600C08960 /* ConstraintDescription.swift in Sources */,
@@ -690,14 +704,16 @@
 				EE235FBA1C5785D400C08960 /* ConstraintMakerRelatable.swift in Sources */,
 				EE235F871C5785C600C08960 /* ConstraintAttributes.swift in Sources */,
 				EE235FA21C5785CE00C08960 /* ConstraintOffsetTarget.swift in Sources */,
-				EEF68FAC1D784E3800980C26 /* UILayoutGuideDSL.swift in Sources */,
+				EEF68FAC1D784E3800980C26 /* ConstraintLayoutGuideDSL.swift in Sources */,
 				EE235FB71C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */,
+				EEF68FBE1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAE1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
 				EE235F961C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
 				EE235FBD1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */,
 				EEF68FAE1D784E3B00980C26 /* ConstraintDSL.swift in Sources */,
 				EE235F8A1C5785C600C08960 /* ConstraintItem.swift in Sources */,
 				EE235F9C1C5785CE00C08960 /* ConstraintPriorityTarget.swift in Sources */,
+				EEF68FC21D7865AA00980C26 /* ConstraintLayoutSupport.swift in Sources */,
 				EEF68FB21D784FB100980C26 /* UILayoutGuide+Extensions.swift in Sources */,
 				EE235F781C5785C600C08960 /* ConstraintConfig.swift in Sources */,
 				EE235F6F1C5785C600C08960 /* Constraint.swift in Sources */,
@@ -708,7 +724,7 @@
 				EE235F9F1C5785CE00C08960 /* ConstraintMultiplierTarget.swift in Sources */,
 				EE235FC21C5785DC00C08960 /* ConstraintViewDSL.swift in Sources */,
 				EE235F611C5785BC00C08960 /* Debugging.swift in Sources */,
-				EE235FC51C5785DC00C08960 /* UILayoutSupportDSL.swift in Sources */,
+				EE235FC51C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */,
 				EE235F811C5785C600C08960 /* ConstraintRelation.swift in Sources */,
 				EEF68FB61D784FBA00980C26 /* UILayoutSupport+Extensions.swift in Sources */,
 				EE235F721C5785C600C08960 /* ConstraintDescription.swift in Sources */,

Source/Constraint.swift

@@ -81,41 +81,49 @@ public class Constraint {
         for layoutFromAttribute in layoutFromAttributes {
             // get layout to attribute
             let layoutToAttribute: NSLayoutAttribute
-            if layoutToAttributes.count > 1 {
+            #if os(iOS) || os(tvOS)
-                if self.from.attributes == .edges && self.to.attributes == .margins {
+                if layoutToAttributes.count > 1 {
-                    switch layoutFromAttribute {
+                    if self.from.attributes == .edges && self.to.attributes == .margins {
-                    case .left:
+                        switch layoutFromAttribute {
-                        layoutToAttribute = .leftMargin
+                        case .left:
-                    case .right:
+                            layoutToAttribute = .leftMargin
-                        layoutToAttribute = .rightMargin
+                        case .right:
-                    case .top:
+                            layoutToAttribute = .rightMargin
-                        layoutToAttribute = .topMargin
+                        case .top:
-                    case .bottom:
+                            layoutToAttribute = .topMargin
-                        layoutToAttribute = .bottomMargin
+                        case .bottom:
-                    default:
+                            layoutToAttribute = .bottomMargin
-                        fatalError()
+                        default:
+                            fatalError()
+                        }
+                    } else if self.from.attributes == .margins && self.to.attributes == .edges {
+                        switch layoutFromAttribute {
+                        case .leftMargin:
+                            layoutToAttribute = .left
+                        case .rightMargin:
+                            layoutToAttribute = .right
+                        case .topMargin:
+                            layoutToAttribute = .top
+                        case .bottomMargin:
+                            layoutToAttribute = .bottom
+                        default:
+                            fatalError()
+                        }
+                    } else {
+                        layoutToAttribute = layoutToAttributes[0]
                     }
-                } else if self.from.attributes == .margins && self.to.attributes == .edges {
+                } else if layoutToAttributes.count == 1 {
-                    switch layoutFromAttribute {
-                    case .leftMargin:
-                        layoutToAttribute = .left
-                    case .rightMargin:
-                        layoutToAttribute = .right
-                    case .topMargin:
-                        layoutToAttribute = .top
-                    case .bottomMargin:
-                        layoutToAttribute = .bottom
-                    default:
-                        fatalError()
-                    }
-                } else {
                     layoutToAttribute = layoutToAttributes[0]
+                } else {
+                    layoutToAttribute = layoutFromAttribute
                 }
-            } else if layoutToAttributes.count == 1 {
+            #else
-                layoutToAttribute = layoutToAttributes[0]
+                if layoutToAttributes.count > 0 {
-            } else {
+                    layoutToAttribute = layoutToAttributes[0]
-                layoutToAttribute = layoutFromAttribute
+                } else {
-            }
+                    layoutToAttribute = layoutFromAttribute
+                }
+            #endif
             
             // get layout constant
             let layoutConstant: CGFloat = self.constant.constraintConstantTargetValueFor(layoutAttribute: layoutToAttribute)

Source/ConstraintConstantTarget.swift

@@ -124,17 +124,17 @@ extension ConstraintConstantTarget {
                 case .top, .centerY, .lastBaseline, .firstBaseline:
                     return value.top
                 case .right:
-                    return value.right
+                    return -value.right
                 case .bottom:
-                    return value.bottom
+                    return -value.bottom
                 case .leading:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : -value.right
                 case .trailing:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.right : -value.left
                 case .width:
-                    return -value.left + value.right
+                    return -(value.left + value.right)
                 case .height:
-                    return -value.top + value.bottom
+                    return -(value.top + value.bottom)
                 case .notAnAttribute:
                     return 0.0
                 }

Source/ConstraintLayoutGuide.swift

@@ -0,0 +1,36 @@
+//
+//  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)
+    @available(iOS 9.0, *)
+    public typealias ConstraintLayoutGuide = UILayoutGuide
+#else
+    public class ConstraintLayoutGuide {}
+#endif

Source/ConstraintLayoutGuideDSL.swift

@@ -29,15 +29,15 @@
 
 
 @available(iOS 9.0, *)
-public struct UILayoutGuideDSL: ConstraintAttributesDSL {
+public struct ConstraintLayoutGuideDSL: ConstraintAttributesDSL {
     
     public var target: AnyObject? {
         return self.guide
     }
     
-    internal let guide: UILayoutGuide
+    internal let guide: ConstraintLayoutGuide
     
-    internal init(guide: UILayoutGuide) {
+    internal init(guide: ConstraintLayoutGuide) {
         self.guide = guide
         
     }

Source/ConstraintLayoutSupport.swift

@@ -0,0 +1,36 @@
+//
+//  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)
+    @available(iOS 8.0, *)
+    public typealias ConstraintLayoutSupport = UILayoutSupport
+#else
+    public class ConstraintLayoutSupport {}
+#endif

Source/ConstraintLayoutSupportDSL.swift

@@ -29,15 +29,15 @@
 
 
 @available(iOS 8.0, *)
-public struct UILayoutSupportDSL: ConstraintDSL {
+public struct ConstraintLayoutSupportDSL: ConstraintDSL {
     
     public var target: AnyObject? {
         return self.support
     }
     
-    internal let support: UILayoutSupport
+    internal let support: ConstraintLayoutSupport
     
-    internal init(support: UILayoutSupport) {
+    internal init(support: ConstraintLayoutSupport) {
         self.support = support
         
     }

Source/UILayoutGuide+Extensions.swift

@@ -27,10 +27,10 @@
     
     
 @available(iOS 9.0, *)
-public extension UILayoutGuide {
+public extension ConstraintLayoutGuide {
     
-    public var snp: UILayoutGuideDSL {
+    public var snp: ConstraintLayoutGuideDSL {
-        return UILayoutGuideDSL(guide: self)
+        return ConstraintLayoutGuideDSL(guide: self)
     }
     
 }

Source/UILayoutSupport+Extensions.swift

@@ -27,10 +27,10 @@
 
     
 @available(iOS 8.0, *)
-public extension UILayoutSupport {
+public extension ConstraintLayoutSupport {
     
-    public var snp: UILayoutSupportDSL {
+    public var snp: ConstraintLayoutSupportDSL {
-        return UILayoutSupportDSL(support: self)
+        return ConstraintLayoutSupportDSL(support: self)
     }
     
 }

Tests/Tests.swift

@@ -29,24 +29,6 @@ class SnapKitTests: XCTestCase {
         super.tearDown()
     }
     
-    func testLayoutGuideConstraints() {
-        #if os(iOS) || os(tvOS)
-            let vc = UIViewController()
-            vc.view = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
-            
-            vc.view.addSubview(self.container)
-            
-            self.container.snp.makeConstraints { (make) -> Void in
-                make.top.equalTo(vc.topLayoutGuide.snp.bottom)
-                make.bottom.equalTo(vc.bottomLayoutGuide.snp.top)
-            }
-            
-            print(vc.view.snp_constraints)
-            
-            XCTAssertEqual(vc.view.snp_constraints.count, 6, "Should have 6 constraints installed")
-        #endif
-    }
-    
     func testMakeConstraints() {
         let v1 = View()
         let v2 = View()
@@ -324,12 +306,12 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(constraints[3].constant, -50, "Should be -50")
     }
     
-    func testUIEdgeInsetsAsImpliedEqualToConstraints() {
+    func testConstraintInsetsAsImpliedEqualToConstraints() {
         let view = View()
         self.container.addSubview(view)
         
         view.snp.makeConstraints { (make) -> Void in
-            make.edges.equalTo(UIEdgeInsets(top: 25, left: 25, bottom: 25, right: 25))
+            make.edges.equalTo(ConstraintInsets(top: 25, left: 25, bottom: 25, right: 25))
         }
         
         XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
@@ -343,12 +325,12 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(constraints[3].constant, -25, "Should be -25")
     }
     
-    func testUIEdgeInsetsAsConstraintsConstant() {
+    func testConstraintInsetsAsConstraintsConstant() {
         let view = View()
         self.container.addSubview(view)
         
         view.snp.makeConstraints { (make) -> Void in
-            make.edges.equalTo(self.container).inset(UIEdgeInsets(top: 25, left: 25, bottom: 25, right: 25))
+            make.edges.equalTo(self.container).inset(ConstraintInsets(top: 25, left: 25, bottom: 25, right: 25))
         }
         
         XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
@@ -418,6 +400,7 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(constraints[0].identifier, identifier, "Identifier should be 'Test'")
     }
     
+    #if os(iOS) || os(tvOS)
     func testEdgesToMargins() {
         var fromAttributes = Set<NSLayoutAttribute>()
         var toAttributes = Set<NSLayoutAttribute>()
@@ -458,4 +441,21 @@ class SnapKitTests: XCTestCase {
         
     }
     
+    func testLayoutGuideConstraints() {
+        let vc = UIViewController()
+        vc.view = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
+        
+        vc.view.addSubview(self.container)
+        
+        self.container.snp.makeConstraints { (make) -> Void in
+        make.top.equalTo(vc.topLayoutGuide.snp.bottom)
+        make.bottom.equalTo(vc.bottomLayoutGuide.snp.top)
+        }
+        
+        print(vc.view.snp_constraints)
+        
+        XCTAssertEqual(vc.view.snp_constraints.count, 6, "Should have 6 constraints installed")
+    }
+    #endif
+    
 }