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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // | ||
| // ContentView.swift | ||
| // Demo | ||
| // | ||
| // Created by 王楚江 on 2021/3/16. | ||
| // | ||
|
|
||
| import SwiftUI | ||
|
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| struct AnimatableSystemFontModifier: AnimatableModifier { | ||
| var size: CGFloat | ||
| var weight: Font.Weight | ||
| var design: Font.Design | ||
|
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| var animatableData: CGFloat { | ||
| get { size } | ||
| set { size = newValue } | ||
| } | ||
|
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| func body(content: Content) -> some View { | ||
| content | ||
| .font(.system(size: size, weight: weight, design: design)) | ||
| } | ||
| } | ||
|
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| extension View { | ||
| func animatableSystemFont(size: CGFloat, weight: Font.Weight = .regular, design: Font.Design = .default) -> some View { | ||
| self.modifier(AnimatableSystemFontModifier(size: size, weight: weight, design: design)) | ||
| } | ||
| } | ||
|
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| struct ContentView: View { | ||
| @State private var fontSize: CGFloat = 32 | ||
|
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| var body: some View { | ||
| Text("Hello, World!") | ||
| .animatableSystemFont(size: fontSize) | ||
| .onTapGesture { | ||
| withAnimation(Animation.spring(response: 0.5, dampingFraction: 0.5, blendDuration: 1).repeatForever()) { | ||
| fontSize = 72 | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| struct ContentView_Previews: PreviewProvider { | ||
| static var previews: some View { | ||
| ContentView() | ||
| } | ||
| } |
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