Created
July 29, 2024 09:35
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RingAnimation
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| import SwiftUI | |
| struct ContentView: View { | |
| @State var progress = 0.0 | |
| var body: some View { | |
| ZStack { | |
| Ring(value: progress, speed: 4) | |
| .foregroundStyle(gradation(.yellow, .orange)) | |
| .frame(width: 120) | |
| Ring(value: progress, speed: 3) | |
| .foregroundStyle(gradation(.mint, .green)) | |
| .frame(width: 150) | |
| Ring(value: progress, speed: 2) | |
| .foregroundStyle(gradation(.cyan, .blue)) | |
| .frame(width: 180) | |
| } | |
| .frame(maxWidth: .infinity, maxHeight: .infinity) | |
| .contentShape(Rectangle()) | |
| .ignoresSafeArea() | |
| .onTapGesture(perform: start) | |
| } | |
| func gradation(_ colors: Color...) -> LinearGradient { | |
| LinearGradient(colors: colors, startPoint: .top, endPoint: .bottom) | |
| } | |
| func start() { | |
| progress = 0 | |
| withAnimation(.linear(duration: 4).repeatForever(autoreverses: false)) { | |
| progress = 1 | |
| } | |
| } | |
| } | |
| struct Ring: View, Animatable { | |
| var value = 0.0 | |
| var speed = 1.0 | |
| var animatableData: Double { | |
| get { max(min(value, 1), 0) } | |
| set { value = max(min(newValue, 1), 0) } | |
| } | |
| var body: some View { | |
| let fraction = fraction | |
| ZStack { | |
| Circle() | |
| .stroke(lineWidth: 8) | |
| .foregroundStyle(.gray.opacity(0.3)) | |
| Circle() | |
| .trim(from: fraction.from, to: fraction.to) | |
| .stroke(style: StrokeStyle(lineWidth: 10, lineCap: .round, lineJoin: .round)) | |
| .rotationEffect(.degrees(-90.0 + (360.0 * speed * value))) | |
| } | |
| } | |
| var fraction: (from: Double, to: Double) { | |
| if value <= 0.5 { | |
| return (0, value * 2) | |
| } else { | |
| return (((value - 0.5) * 2), 1) | |
| } | |
| } | |
| } | |
| #Preview { | |
| ContentView() | |
| } |
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