Fix Swift 4.1 build on Xcode 9.

Author: eddiekaiger

SwiftyAttributes/Sources/common/Attribute+Sequence.swift

@@ -10,7 +10,7 @@
  An extension on dictionaries that allows us to convert a Foundation-based dictionary of attributes to an array of `Attribute`s.
  */
 #if swift(>=4.0)
-    extension Dictionary where Key == NSAttributedString.Key {
+    extension Dictionary where Key == AttributeName {
 
         /// Returns an array of `Attribute`s converted from the dictionary of attributes. Use this whenever you want to convert [NSAttributeStringKey: Any] to [Attribute].
         public var swiftyAttributes: [Attribute] {

SwiftyAttributes/Sources/common/Attribute.swift

@@ -28,8 +28,10 @@ public typealias Shadow = NSShadow
 public typealias TextAttachment = NSTextAttachment
 #endif
 
-#if swift(>=4.0)
+#if swift(>=4.2)
     public typealias AttributeName = NSAttributedString.Key
+#elseif swift(>=4.0)
+    public typealias AttributeName = NSAttributedStringKey
 #else
     public typealias AttributeName = Attribute.Name
 #endif

SwiftyAttributes/Sources/common/NSAttributedString+SwiftyAttributes.swift

@@ -9,7 +9,7 @@
 import Foundation
 
 #if swift(>=4.0)
-    public typealias StringKey = NSAttributedString.Key
+    public typealias StringKey = AttributeName
 #else
     public typealias StringKey = String
 #endif

SwiftyAttributesTests/Attribute+Sequence_Tests.swift

@@ -13,7 +13,7 @@ class Attribute_Sequence_Tests: XCTestCase {
 
     func testDictionaryToSwiftyAttributes() {
         #if swift(>=4.0)
-            let dict: [NSAttributedString.Key: Any] = [
+            let dict: [AttributeName: Any] = [
                 .baselineOffset: 3.2,
                 .expansion: 5,
                 .foregroundColor: Color.red
@@ -37,7 +37,7 @@ class Attribute_Sequence_Tests: XCTestCase {
 
     func testDictionaryToSwiftyAttributes_withCustomValues() {
         #if swift(>=4.0)
-            let dict: [NSAttributedString.Key: Any] = [
+            let dict: [AttributeName: Any] = [
                 .baselineOffset: 3.2,
                 .foregroundColor: Color.red,
                 .init("Foo"): 5
@@ -66,7 +66,7 @@ class Attribute_Sequence_Tests: XCTestCase {
             .custom("Foo", 42)
         ]
         #if swift(>=4.0)
-            let expected: [NSAttributedString.Key: Any] = [
+            let expected: [AttributeName: Any] = [
                 .kern: 3.5,
                 .link: URL(string: "www.google.com")!,
                 .init(rawValue: "Foo"): 42

SwiftyAttributesTests/NSAttributedString_Tests.swift

@@ -452,7 +452,7 @@ class NSAttributedString_Tests: XCTestCase {
     func testFontAttributes_onlyFontAttributes() {
         let subject = "Hello".withFont(.systemFont(ofSize: 19)).fontAttributes(in: 0 ..< 3).foundationAttributes
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.font
+            let attributeName = AttributeName.font
         #else
             let attributeName = NSFontAttributeName
         #endif
@@ -465,8 +465,8 @@ class NSAttributedString_Tests: XCTestCase {
         let url = URL(string: "www.google.com")!
         let subject = "Hello".withAttributes([.font(.systemFont(ofSize: 19)), .link(url)]).fontAttributes(in: 0 ..< 3).foundationAttributes
         #if swift(>=4.0)
-            let fontAttributeName = NSAttributedString.Key.font
-            let linkAttributeName = NSAttributedString.Key.link
+            let fontAttributeName = AttributeName.font
+            let linkAttributeName = AttributeName.link
         #else
             let fontAttributeName = NSFontAttributeName
             let linkAttributeName = NSLinkAttributeName
@@ -483,7 +483,7 @@ class NSAttributedString_Tests: XCTestCase {
         style.alignment = .center
         let subject = "Hello".withParagraphStyle(style).rulerAttributes(in: 1 ..< 3).foundationAttributes
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.paragraphStyle
+            let attributeName = AttributeName.paragraphStyle
         #else
             let attributeName = NSParagraphStyleAttributeName
         #endif

SwiftyAttributesTests/NSMutableAttributedString_Tests.swift

@@ -18,7 +18,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.addAttributes([.link(URL(string: "https://google.com")!)], range: 1 ..< 3)
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let linkAttributeName = NSAttributedString.Key.link
+            let linkAttributeName = AttributeName.link
         #else
             let linkAttributeName = NSLinkAttributeName
         #endif
@@ -33,7 +33,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.addAttributes([.font(.boldSystemFont(ofSize: 17))], range: NSRange(location: 0, length: 1))
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let fontAttributeName = NSAttributedString.Key.font
+            let fontAttributeName = AttributeName.font
         #else
             let fontAttributeName = NSFontAttributeName
         #endif
@@ -48,7 +48,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.setAttributes([.backgroundColor(.orange)], range: 0 ..< 3)
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.backgroundColor
+            let attributeName = AttributeName.backgroundColor
         #else
             let attributeName = NSBackgroundColorAttributeName
         #endif
@@ -63,7 +63,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.setAttributes([.backgroundColor(.orange)], range: NSRange(location: 2, length: 2))
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.backgroundColor
+            let attributeName = AttributeName.backgroundColor
         #else
             let attributeName = NSBackgroundColorAttributeName
         #endif
@@ -88,7 +88,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.replaceCharacters(in: 0 ..< 2, with: "Chi".withBackgroundColor(.magenta))
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.backgroundColor
+            let attributeName = AttributeName.backgroundColor
         #else
             let attributeName = NSBackgroundColorAttributeName
         #endif
@@ -113,7 +113,7 @@ class NSMutableAttributedString_Tests: XCTestCase {
         subject.removeAttribute(.baselineOffset, range: 1 ..< 4)
         XCTAssertNotEqual(subject, expected)
         #if swift(>=4.0)
-            let attributeName = NSAttributedString.Key.baselineOffset
+            let attributeName = AttributeName.baselineOffset
         #else
             let attributeName = NSBaselineOffsetAttributeName
         #endif

SwiftyAttributesTests/Operators_Tests.swift

@@ -16,9 +16,9 @@ class Operators_Tests: XCTestCase {
         let rhs = "World".withTextColor(.magenta).withBackgroundColor(.orange).withFont(.boldSystemFont(ofSize: 24))
         let newString = lhs + rhs
         #if swift(>=4.0)
-            let leftAttributes: [NSAttributedString.Key: NSObject] = [.font: Font.systemFont(ofSize: 19)]
+            let leftAttributes: [AttributeName: NSObject] = [.font: Font.systemFont(ofSize: 19)]
             XCTAssertEqual(newString.attributes(at: 0, effectiveRange: nil) as NSDictionary, leftAttributes as NSDictionary)
-            let rightAttributes: [NSAttributedString.Key: NSObject] = [
+            let rightAttributes: [AttributeName: NSObject] = [
                 .foregroundColor: Color.magenta,
                 .backgroundColor: Color.orange,
                 .font: Font.boldSystemFont(ofSize: 24)