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SwiftUI開発サンプル(Preview,View加工,ViewAnimation)

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PreviewのResumeボタン押すのをショートカットキーでやるには?

この操作自体は
メニューバーのEditor -> Canvas -> Refresh Canvas
これでできます。

ショートカットキー(Key Bindings)には
command + option + p
デフォルトでこちらが割り当てられています。

PreviewのViewのサイズを小さくして要素の大きさに合わせる

.previewLayout(.sizeThatFits)

Viewの加工

Viewを丸でくり抜くには?
.clipShape(Circle())
Viewに影をつけるには?
.shadow(radius: )
Viewに丸い線を上に重ねる
.overlay {
    Circle().stroke(, lineWidth: )
}
組み合わせる
Text("Circle\nShadow\nOverlay")
    .frame(width: 100, height: 100)
    .foregroundColor(.white)
    .background(.blue)
    .clipShape(Circle())
    .shadow(radius: 7)
    .overlay {
        Circle().stroke(.white, lineWidth: 4)
    }

Viewのアニメーション

回転
.rotationEffect(.degrees(isOn ? 90 : 0))
拡大縮小
.scaleEffect(isOn ? 1.5: 1)
透明度
.opacity(isOn ? 1.0 : 0)
値の変更をwithAnimationブロックで囲うことでアニメーションする
@State private var isOn = false
...
wthAnimation {
    isOn.toggle()
}
Button {
    withAnimation {
        isOn.toggle()
    }
} label: {
    Text(">")
        .opacity(isOn ? 1.0 : 0.5)
        .rotationEffect(.degrees(isOn ? 90 : 0))
        .scaleEffect(isOn ? 0.8: 2.0)
        .padding()
}
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