Enforce availablility for iOS 8.0+ Attributes

Source/ConstraintAttributes.swift

@@ -67,14 +67,23 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     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, *)
     internal static var LeftMargin: ConstraintAttributes { return self.init(4096) }
+    @available(iOS 8.0, *)
     internal static var RightMargin: ConstraintAttributes { return self.init(8192) }
+    @available(iOS 8.0, *)
     internal static var TopMargin: ConstraintAttributes { return self.init(16384) }
+    @available(iOS 8.0, *)
     internal static var BottomMargin: ConstraintAttributes { return self.init(32768) }
+    @available(iOS 8.0, *)
     internal static var LeadingMargin: ConstraintAttributes { return self.init(65536) }
+    @available(iOS 8.0, *)
     internal static var TrailingMargin: ConstraintAttributes { return self.init(131072) }
+    @available(iOS 8.0, *)
     internal static var CenterXWithinMargins: ConstraintAttributes { return self.init(262144) }
+    @available(iOS 8.0, *)
     internal static var CenterYWithinMargins: ConstraintAttributes { return self.init(524288) }
     #endif
     
@@ -85,7 +94,9 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     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
     
@@ -125,6 +136,9 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
             attrs.append(.Baseline)
         }
         #if os(iOS)
+        guard #available(iOS 8.0, *) else {
+            fatalError("Constrant attribute unavaialble for running platform and deployment target.")
+        }
         if (self.contains(ConstraintAttributes.FirstBaseline)) {
             attrs.append(.FirstBaseline)
         }

Source/ConstraintDescription.swift

@@ -153,14 +153,23 @@ public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable
     var baseline: ConstraintDescriptionExtendable { get }
     
     #if os(iOS)
+    @available(iOS 8.0, *)
     var firstBaseline: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var leftMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var rightMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var topMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var bottomMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var leadingMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var trailingMargin: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var centerXWithinMargins: ConstraintDescriptionExtendable { get }
+    @available(iOS 8.0, *)
     var centerYWithinMargins: ConstraintDescriptionExtendable { get }
     #endif
 }
@@ -183,14 +192,23 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
     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, *)
     internal var leftMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeftMargin) }
+    @available(iOS 8.0, *)
     internal var rightMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.RightMargin) }
+    @available(iOS 8.0, *)
     internal var topMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TopMargin) }
+    @available(iOS 8.0, *)
     internal var bottomMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.BottomMargin) }
+    @available(iOS 8.0, *)
     internal var leadingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeadingMargin) }
+    @available(iOS 8.0, *)
     internal var trailingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TrailingMargin) }
+    @available(iOS 8.0, *)
     internal var centerXWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
+    @available(iOS 8.0, *)
     internal var centerYWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
     #endif
     

Source/ConstraintMaker.swift

@@ -68,30 +68,39 @@ public class ConstraintMaker {
     #if os(iOS)
     
     /// firse baseline position
+    @available(iOS 8.0, *)
     public var firstBaseline: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.FirstBaseline) }
     
     /// left margin
+    @available(iOS 8.0, *)
     public var leftMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.LeftMargin) }
     
     /// right margin
+    @available(iOS 8.0, *)
     public var rightMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.RightMargin) }
     
     /// top margin
+    @available(iOS 8.0, *)
     public var topMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.TopMargin) }
     
     /// bottom margin
+    @available(iOS 8.0, *)
     public var bottomMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.BottomMargin) }
     
     /// leading margin
+    @available(iOS 8.0, *)
     public var leadingMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.LeadingMargin) }
     
     /// trailing margin
+    @available(iOS 8.0, *)
     public var trailingMargin: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.TrailingMargin) }
     
     /// centerX within margins
+    @available(iOS 8.0, *)
     public var centerXWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterXWithinMargins) }
     
     /// centerY within margins
+    @available(iOS 8.0, *)
     public var centerYWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterYWithinMargins) }
     
     #endif
@@ -108,9 +117,11 @@ public class ConstraintMaker {
     #if os(iOS)
     
     // top + left + bottom + right margins
+    @available(iOS 8.0, *)
     public var margins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.Margins) }
     
     // centerX + centerY within margins
+    @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterWithinMargins) }
     
     #endif

Source/View+SnapKit.swift

@@ -70,30 +70,39 @@ public extension View {
     #if os(iOS)
     
     /// first baseline position
+    @available(iOS 8.0, *)
     public var snp_firstBaseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.FirstBaseline) }
     
     /// left margin
+    @available(iOS 8.0, *)
     public var snp_leftMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeftMargin) }
     
     /// right margin
+    @available(iOS 8.0, *)
     public var snp_rightMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.RightMargin) }
     
     /// top margin
+    @available(iOS 8.0, *)
     public var snp_topMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TopMargin) }
     
     /// bottom margin
+    @available(iOS 8.0, *)
     public var snp_bottomMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.BottomMargin) }
     
     /// leading margin
+    @available(iOS 8.0, *)
     public var snp_leadingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeadingMargin) }
     
     /// trailing margin
+    @available(iOS 8.0, *)
     public var snp_trailingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TrailingMargin) }
     
     /// centerX within margins
+    @available(iOS 8.0, *)
     public var snp_centerXWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterXWithinMargins) }
     
     /// centerY within margins
+    @available(iOS 8.0, *)
     public var snp_centerYWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterYWithinMargins) }
     
     #endif
@@ -110,9 +119,11 @@ public extension View {
     #if os(iOS)
     
     // top + left + bottom + right margins
+    @available(iOS 8.0, *)
     public var snp_margins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Margins) }
     
     // centerX + centerY within margins
+    @available(iOS 8.0, *)
     public var snp_centerWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterWithinMargins) }
     
     #endif