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【SwiftUI】特定の条件でのみアニメーションをループさせる

Posted at

はじめに

特定条件の場合のみ、ループアニメーションを付与します。

サンプルアプリ

Simulator Screen Recording - iPhone 14 Pro - 2023-02-04 at 20.16.09.gif

やりかた

ContentView
import SwiftUI

struct ContentView: View {
    @State var isAnimation: Bool = false
    var body: some View {
        VStack(spacing: 50) {
            Toggle("", isOn: $isAnimation)
                .labelsHidden()

            Button {
                print()
            } label: {
                Text("ボタン")
            }
            .buttonStyle(.borderedProminent)
            .scaleEffect(isAnimation ? 1.5 : 1.0)
            .animation(.default.repeat(while: isAnimation), value: isAnimation)
        }
    }
}
Animation+
import struct SwiftUI.Animation

extension Animation {
    func `repeat`(while expression: Bool, autoreverses: Bool = true) -> Animation {
        if expression {
            return self.repeatForever(autoreverses: autoreverses)
        } else {
            return self
        }
    }
}

おわり

animationのAPIが新しくなってからはじめに使いました笑

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