Created
August 4, 2024 01:20
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Color animation
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| import SwiftUI | |
| extension Color { | |
| static var random: Self { | |
| Color( | |
| hue: .random(in: 0..<1), | |
| saturation: .random(in: (0.9)..<1), | |
| brightness: .random(in: (0.9)..<1) | |
| ) | |
| } | |
| } | |
| struct ContentView: View { | |
| @State var color: Color = .random | |
| @State var timer: Timer? | |
| var body: some View { | |
| FooView(color: color) | |
| .ignoresSafeArea() | |
| .onAppear { | |
| timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { timer in | |
| withAnimation { | |
| color = .random | |
| } | |
| } | |
| } | |
| .onDisappear { | |
| timer?.invalidate() | |
| } | |
| } | |
| } | |
| struct FooView: View, Animatable { | |
| @Environment(\.self) var environment | |
| var color: Color | |
| var animatableData: Color.Resolved.AnimatableData { | |
| get { | |
| color.resolve(in: environment).animatableData | |
| } | |
| set(value) { | |
| var resolved = color.resolve(in: environment) | |
| resolved.animatableData = value | |
| color = Color(resolved) | |
| } | |
| } | |
| var body: some View { | |
| ZStack { | |
| color | |
| .clipShape(.circle) | |
| .padding() | |
| .padding() | |
| Text(description) | |
| .font(.largeTitle) | |
| .bold() | |
| .monospaced() | |
| .contentTransition(.numericText(countsDown: true)) | |
| .animation(.default, value: color) | |
| .foregroundStyle(textColor) | |
| .foregroundStyle(.black) | |
| } | |
| } | |
| var description: String { | |
| func value(_ v: Color.Resolved, _ k: KeyPath<Color.Resolved, Float>) -> String { | |
| let value = min(max(Int(v[keyPath: k] * Float(UInt8.max)), 0), 255) | |
| return String(format: "%02x", value).uppercased() | |
| } | |
| let resolved = color.resolve(in: environment) | |
| let red = value(resolved, \.red) | |
| let green = value(resolved, \.green) | |
| let blue = value(resolved, \.blue) | |
| return "#\(red)\(green)\(blue)" | |
| } | |
| var textColor: some ShapeStyle { | |
| let color = color.resolve(in: environment) | |
| let luminance = 0.299 * color.red + 0.587 * color.green + 0.114 * color.blue | |
| return luminance > 0.5 ? .black : .white | |
| } | |
| } | |
| #Preview { | |
| ContentView() | |
| } |
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