Add support for SwiftUI `Color` (#84)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Sources/Defaults/Defaults+Bridge.swift

@@ -1,4 +1,5 @@
 import Foundation
+import SwiftUI
 #if os(macOS)
 import AppKit
 #else
@@ -296,6 +297,36 @@ extension Defaults {
 	}
 }
 
+extension Defaults {
+	@available(iOS 15.0, macOS 11.0, tvOS 15.0, watchOS 8.0, iOSApplicationExtension 15.0, macOSApplicationExtension 11.0, tvOSApplicationExtension 15.0, watchOSApplicationExtension 8.0, *)
+	public struct ColorBridge: Bridge {
+		public typealias Value = Color
+		public typealias Serializable = Data
+
+		#if os(macOS)
+		private typealias NativeColor = NSColor
+		#else
+		private typealias NativeColor = UIColor
+		#endif
+
+		public func serialize(_ value: Value?) -> Serializable? {
+			guard let value = value else {
+				return nil
+			}
+
+			return NativeColor.bridge.serialize(NativeColor(value))
+		}
+
+		public func deserialize(_ object: Serializable?) -> Value? {
+			guard let nativeColor = NativeColor.bridge.deserialize(object) else {
+				return nil
+			}
+
+			return Value(nativeColor)
+		}
+	}
+}
+
 extension Defaults {
 	public struct AnyBridge: Defaults.Bridge {
 		public typealias Value = Defaults.AnySerializable

Sources/Defaults/Defaults+Extensions.swift

@@ -1,5 +1,6 @@
 import Foundation
 import CoreGraphics
+import SwiftUI
 #if os(macOS)
 import AppKit
 #else
@@ -136,6 +137,12 @@ extension Dictionary: Defaults.Serializable where Key: LosslessStringConvertible
 	public static var bridge: Defaults.DictionaryBridge<Key, Value> { Defaults.DictionaryBridge() }
 }
 
+
+@available(iOS 15.0, macOS 11.0, tvOS 15.0, watchOS 8.0, iOSApplicationExtension 15.0, macOSApplicationExtension 11.0, tvOSApplicationExtension 15.0, watchOSApplicationExtension 8.0, *)
+extension Color: Defaults.Serializable {
+	public static let bridge = Defaults.ColorBridge()
+}
+
 #if os(macOS)
 /// `NSColor` conforms to `NSSecureCoding`, so it goes to `NSSecureCodingBridge`.
 extension NSColor: Defaults.Serializable {}

Tests/DefaultsTests/DefaultsSwiftUITests.swift

@@ -3,25 +3,35 @@ import Foundation
 import SwiftUI
 import Defaults
 
+#if os(macOS)
+typealias NativeColor = NSColor
+#else
+typealias NativeColor = UIColor
+#endif
+
+@available(macOS 11.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Defaults.Keys {
 	fileprivate static let hasUnicorn = Key<Bool>("swiftui_hasUnicorn", default: false)
 	fileprivate static let user = Key<User>("swiftui_user", default: User(username: "Hank", password: "123456"))
 	fileprivate static let setInt = Key<Set<Int>>("swiftui_setInt", default: Set(1...3))
+	fileprivate static let color = Key<Color>("swiftui_color", default: .black)
 }
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
+@available(macOS 11.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
 struct ContentView: View {
 	@Default(.hasUnicorn) var hasUnicorn
 	@Default(.user) var user
 	@Default(.setInt) var setInt
+	@Default(.color) var color
 
 	var body: some View {
 		Text("User \(user.username) has Unicorn: \(String(hasUnicorn))")
+			.foregroundColor(color)
 		Toggle("Toggle Unicorn", isOn: $hasUnicorn)
 	}
 }
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
+@available(macOS 11.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
 final class DefaultsSwiftUITests: XCTestCase {
 	override func setUp() {
 		super.setUp()
@@ -38,13 +48,17 @@ final class DefaultsSwiftUITests: XCTestCase {
 		XCTAssertFalse(view.hasUnicorn)
 		XCTAssertEqual(view.user.username, "Hank")
 		XCTAssertEqual(view.setInt.count, 3)
+		XCTAssertEqual(NativeColor(view.color), NativeColor(Color.black))
 		view.user = User(username: "Chen", password: "123456")
 		view.hasUnicorn.toggle()
 		view.setInt.insert(4)
+		view.color = Color(.sRGB, red: 100, green: 100, blue: 100, opacity: 1)
 		XCTAssertTrue(view.hasUnicorn)
 		XCTAssertEqual(view.user.username, "Chen")
 		XCTAssertEqual(view.setInt, Set(1...4))
 		XCTAssertFalse(Default(.hasUnicorn).defaultValue)
 		XCTAssertFalse(Default(.hasUnicorn).isDefaultValue)
+		XCTAssertNotEqual(NativeColor(view.color), NativeColor(Color.black))
+		XCTAssertEqual(NativeColor(view.color), NativeColor(Color(.sRGB, red: 100, green: 100, blue: 100, opacity: 1)))
 	}
 }

readme.md

@@ -79,6 +79,7 @@ Add `https://github.com/sindresorhus/Defaults` in the [“Swift Package Manager
 - `URL`
 - `NSColor` (macOS)
 - `UIColor` (iOS)
+- `Color` (SwiftUI)
 - `Codable`
 - `NSSecureCoding`