Fixed iOS 9 layout guides, and better support for legacy platforms

Source/Constraint.swift

@@ -138,10 +138,16 @@ internal class ConcreteConstraint: Constraint {
     }
     
     internal override func activate() -> Void {
-        guard #available(iOS 8.0, OSX 10.10, *), self.installInfo != nil else {
+        guard self.installInfo != nil else {
             self.install()
             return
         }
+        #if SNAPKIT_DEPLOYMENT_LEGACY
+        guard #available(iOS 8.0, OSX 10.10, *) else {
+            self.install()
+            return
+        }
+        #endif
         let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
         if layoutConstraints.count > 0 {
             NSLayoutConstraint.activateConstraints(layoutConstraints)
@@ -149,10 +155,14 @@ internal class ConcreteConstraint: Constraint {
     }
     
     internal override func deactivate() -> Void {
-        guard #available(iOS 8.0, OSX 10.10, *), self.installInfo != nil else {
-            self.install()
+        guard self.installInfo != nil else {
             return
         }
+        #if SNAPKIT_DEPLOYMENT_LEGACY
+        guard #available(iOS 8.0, OSX 10.10, *) else {
+            return
+        }
+        #endif
         let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
         if layoutConstraints.count > 0 {
             NSLayoutConstraint.deactivateConstraints(layoutConstraints)
@@ -241,7 +251,11 @@ internal class ConcreteConstraint: Constraint {
             let layoutConstant: CGFloat = layoutToAttribute.snp_constantForValue(self.constant)
             
             // get layout to
-            var layoutTo: View? = self.toItem.view
+            #if os(iOS)
+            var layoutTo: AnyObject? = self.toItem.view ?? self.toItem.layoutSupport
+            #else
+            var layoutTo: AnyObject? = self.toItem.view
+            #endif
             if layoutTo == nil && layoutToAttribute != .Width && layoutToAttribute != .Height {
                 layoutTo = installOnView
             }

Source/ConstraintAttributes.swift

@@ -66,7 +66,6 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     internal static var CenterY: ConstraintAttributes { return self.init(512) }
     internal static var Baseline: ConstraintAttributes { return self.init(1024) }
     
-    #if os(iOS)
     @available(iOS 8.0, *)
     internal static var FirstBaseline: ConstraintAttributes { return self.init(2048) }
     @available(iOS 8.0, *)
@@ -85,7 +84,6 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     internal static var CenterXWithinMargins: ConstraintAttributes { return self.init(262144) }
     @available(iOS 8.0, *)
     internal static var CenterYWithinMargins: ConstraintAttributes { return self.init(524288) }
-    #endif
     
     // aggregates
     
@@ -93,12 +91,11 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     internal static var Size: ConstraintAttributes { return self.init(192) }
     internal static var Center: ConstraintAttributes { return self.init(768) }
     
-    #if os(iOS)
     @available(iOS 8.0, *)
     internal static var Margins: ConstraintAttributes { return self.init(61440) }
+    
     @available(iOS 8.0, *)
     internal static var CenterWithinMargins: ConstraintAttributes { return self.init(786432) }
-    #endif
     
     internal var layoutAttributes:[NSLayoutAttribute] {
         var attrs = [NSLayoutAttribute]()
@@ -135,10 +132,13 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
         if (self.contains(ConstraintAttributes.Baseline)) {
             attrs.append(.Baseline)
         }
+        
         #if os(iOS)
+        #if SNAPKIT_DEPLOYMENT_LEGACY
         guard #available(iOS 8.0, *) else {
-            fatalError("Constrant attribute unavaialble for running platform and deployment target.")
+            return attrs
         }
+        #endif
         if (self.contains(ConstraintAttributes.FirstBaseline)) {
             attrs.append(.FirstBaseline)
         }
@@ -167,6 +167,7 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
             attrs.append(.CenterYWithinMargins)
         }
         #endif
+        
         return attrs
     }
 }

Source/ConstraintDescription.swift

@@ -93,9 +93,8 @@ public protocol ConstraintDescriptionRelatable: class {
     
     func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable
     func equalTo(other: View) -> ConstraintDescriptionEditable
-    #if os(iOS)
-    func equalTo(other: UILayoutSupport) -> ConstraintDescriptionEditable
-    #endif
+    @available(iOS 7.0, *)
+    func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable
     func equalTo(other: Float) -> ConstraintDescriptionEditable
     func equalTo(other: Double) -> ConstraintDescriptionEditable
     func equalTo(other: CGFloat) -> ConstraintDescriptionEditable
@@ -107,9 +106,8 @@ public protocol ConstraintDescriptionRelatable: class {
     
     func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable
     func lessThanOrEqualTo(other: View) -> ConstraintDescriptionEditable
-    #if os(iOS)
-    func lessThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionEditable
-    #endif
+    @available(iOS 7.0, *)
+    func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable
     func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable
     func lessThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable
     func lessThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable
@@ -121,9 +119,8 @@ public protocol ConstraintDescriptionRelatable: class {
     
     func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable
     func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionEditable
-    #if os(iOS)
-    func greaterThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionEditable
-    #endif
+    @available(iOS 7.0, *)
+    func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable
     func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable
     func greaterThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable
     func greaterThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable
@@ -152,7 +149,6 @@ public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable
     var centerY: ConstraintDescriptionExtendable { get }
     var baseline: ConstraintDescriptionExtendable { get }
     
-    #if os(iOS)
     @available(iOS 8.0, *)
     var firstBaseline: ConstraintDescriptionExtendable { get }
     @available(iOS 8.0, *)
@@ -171,7 +167,6 @@ public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable
     var centerXWithinMargins: ConstraintDescriptionExtendable { get }
     @available(iOS 8.0, *)
     var centerYWithinMargins: ConstraintDescriptionExtendable { get }
-    #endif
 }
 
 /**
@@ -191,7 +186,6 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     internal var centerY: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterY) }
     internal var baseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Baseline) }
     
-    #if os(iOS)
     @available(iOS 8.0, *)
     internal var firstBaseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.FirstBaseline) }
     @available(iOS 8.0, *)
@@ -210,7 +204,6 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     internal var centerXWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
     @available(iOS 8.0, *)
     internal var centerYWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
-    #endif
     
     // MARK: initializer
     
@@ -227,11 +220,10 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     internal func equalTo(other: View) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .Equal)
     }
-    #if os(iOS)
-    internal func equalTo(other: UILayoutSupport) -> ConstraintDescriptionEditable {
+    @available(iOS 7.0, *)
+    internal func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .Equal)
     }
-    #endif
     internal func equalTo(other: Float) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .Equal)
     }
@@ -265,11 +257,10 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     internal func lessThanOrEqualTo(other: View) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .LessThanOrEqualTo)
     }
-    #if os(iOS)
-    internal func lessThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionEditable {
+    @available(iOS 7.0, *)
+    internal func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .LessThanOrEqualTo)
     }
-    #endif
     internal func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .LessThanOrEqualTo)
     }
@@ -303,11 +294,10 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     internal func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
     }
-    #if os(iOS)
-    internal func greaterThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionEditable {
+    @available(iOS 7.0, *)
+    internal func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
     }
-    #endif
     internal func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable {
         return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
     }
@@ -552,14 +542,11 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
         return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
     }
     
-    #if os(iOS)
-    
-    private func constrainTo(other: UILayoutSupport, relation: ConstraintRelation) -> ConstraintDescription {
+    @available(iOS 7.0, *)
+    private func constrainTo(other: LayoutSupport, relation: ConstraintRelation) -> ConstraintDescription {
         return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
     }
     
-    #endif
-    
     private func constrainTo(other: Float, relation: ConstraintRelation) -> ConstraintDescription {
         self.constant = other
         return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

Source/ConstraintItem.swift

@@ -44,13 +44,10 @@ public class ConstraintItem {
         return self.object as? View
     }
     
-    #if os(iOS)
-    
-    internal var layoutSupport: UILayoutSupport? {
-        return self.object as? UILayoutSupport
+    @available(iOS 7.0, *)
+    internal var layoutSupport: LayoutSupport? {
+        return self.object as? LayoutSupport
     }
-    
-    #endif
 }
 
 

Source/ConstraintMaker.swift

@@ -65,8 +65,6 @@ public class ConstraintMaker {
     /// baseline position
     public var baseline: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.Baseline) }
     
-    #if os(iOS)
-    
     /// firse baseline position
     @available(iOS 8.0, *)
     public var firstBaseline: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.FirstBaseline) }
@@ -103,8 +101,6 @@ public class ConstraintMaker {
     @available(iOS 8.0, *)
     public var centerYWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterYWithinMargins) }
     
-    #endif
-    
     /// top + left + bottom + right edges
     public var edges: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.Edges) }
     
@@ -114,8 +110,6 @@ public class ConstraintMaker {
     // centerX + centerY positions
     public var center: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.Center) }
     
-    #if os(iOS)
-    
     // top + left + bottom + right margins
     @available(iOS 8.0, *)
     public var margins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.Margins) }
@@ -124,8 +118,6 @@ public class ConstraintMaker {
     @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterWithinMargins) }
     
-    #endif
-    
     internal init(view: View, file: String, line: UInt) {
         self.view = view
         self.file = file

Source/SnapKit.swift

@@ -24,9 +24,11 @@
 #if os(iOS)
 import UIKit
 public typealias InterfaceLayoutDirection = UIUserInterfaceLayoutDirection
+public typealias LayoutSupport = UILayoutSupport
 #else
 import AppKit
 public typealias InterfaceLayoutDirection = NSUserInterfaceLayoutDirection
+public class LayoutSupport {}
 #endif
 
 /**

Source/View+SnapKit.swift

@@ -67,8 +67,6 @@ public extension View {
     /// baseline position
     public var snp_baseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Baseline) }
     
-    #if os(iOS)
-    
     /// first baseline position
     @available(iOS 8.0, *)
     public var snp_firstBaseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.FirstBaseline) }
@@ -105,8 +103,6 @@ public extension View {
     @available(iOS 8.0, *)
     public var snp_centerYWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterYWithinMargins) }
     
-    #endif
-    
     // top + left + bottom + right edges
     public var snp_edges: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Edges) }
     
@@ -116,8 +112,6 @@ public extension View {
     // centerX + centerY positions
     public var snp_center: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Center) }
     
-    #if os(iOS)
-    
     // top + left + bottom + right margins
     @available(iOS 8.0, *)
     public var snp_margins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Margins) }
@@ -126,8 +120,6 @@ public extension View {
     @available(iOS 8.0, *)
     public var snp_centerWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterWithinMargins) }
     
-    #endif
-    
     /**
         Prepares constraints with a `ConstraintMaker` and returns the made constraints but does not install them.