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Keyframe Animation Example in SwiftUI
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| import SwiftUI | |
| struct KeyframeValues { | |
| var scale = 1.0 | |
| var horizontalStretch = 1.0 | |
| var verticalStretch = 1.0 | |
| var translation = 0.0 | |
| var rotation = Angle.zero | |
| } | |
| struct KeyframeView: View { | |
| @State private var trigger: Bool = false | |
| var body: some View { | |
| ZStack { | |
| Color.yellow | |
| .ignoresSafeArea() | |
| .onTapGesture { | |
| trigger.toggle() | |
| } | |
| ImageView() | |
| .keyframeAnimator(initialValue: KeyframeValues(), trigger: trigger) { content, value in | |
| content | |
| .scaleEffect(value.scale) | |
| .scaleEffect(x: value.horizontalStretch, y: value.verticalStretch) | |
| .offset(y: value.translation) | |
| .rotationEffect(value.rotation) | |
| } keyframes: { value in | |
| KeyframeTrack(\.scale) { | |
| LinearKeyframe(1.0, duration: 0.5) | |
| SpringKeyframe(1.4, duration: 0.7) | |
| SpringKeyframe(1.0, spring: .bouncy) | |
| } | |
| KeyframeTrack(\.translation) { | |
| LinearKeyframe(0.0, duration: 0.4) | |
| SpringKeyframe(15.0, duration: 0.1, spring: .bouncy) | |
| SpringKeyframe(-50.0, duration: 0.7, spring: .bouncy) | |
| SpringKeyframe(15.0, duration: 0.05, spring: .bouncy) | |
| SpringKeyframe(0.0, spring: .bouncy) | |
| } | |
| KeyframeTrack(\.horizontalStretch) { | |
| CubicKeyframe(1.0, duration: 0.4) | |
| CubicKeyframe(1.6, duration: 0.1) | |
| CubicKeyframe(0.8, duration: 0.05) | |
| CubicKeyframe(0.95, duration: 0.15) | |
| CubicKeyframe(1.0, duration: 0.7) | |
| CubicKeyframe(1.1, duration: 0.15) | |
| CubicKeyframe(1.0, duration: 0.2) | |
| } | |
| KeyframeTrack(\.verticalStretch) { | |
| CubicKeyframe(1.0, duration: 0.4) | |
| CubicKeyframe(0.8, duration: 0.1) | |
| CubicKeyframe(1.2, duration: 0.05) | |
| CubicKeyframe(1.05, duration: 0.15) | |
| CubicKeyframe(1.0, duration: 0.7) | |
| CubicKeyframe(0.9, duration: 0.15) | |
| CubicKeyframe(1.0, duration: 0.2) | |
| } | |
| KeyframeTrack(\.rotation) { | |
| LinearKeyframe(Angle.zero, duration: 0.8) | |
| SpringKeyframe(Angle(degrees: 50), duration: 0.08) | |
| SpringKeyframe(Angle(degrees: -50), duration: 0.08) | |
| SpringKeyframe(Angle.zero, duration: 0.5, spring: .bouncy) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| struct ImageView: View { | |
| var body: some View { | |
| Image(systemName: "apple.logo") | |
| .symbolVariant(.fill) | |
| .foregroundStyle(.black) | |
| .font(.system(size: 100)) | |
| } | |
| } |
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