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paiza×Qiita記事投稿キャンペーン「プログラミング問題をやってみて書いたコードを投稿しよう!」

【SwiftUI】アニメーションとトランジションを組み合わせて連続して使う

Last updated at Posted at 2024-08-23

こんなカクカクのメッセージ的な表示。

sc 2024-08-23 at 11.20.52.gif

import SwiftUI

struct Message: View {
  var text: String

  @State private var showIcon = false
  @State private var showText = false

  var body: some View {
    HStack(spacing: 0) {
      if showIcon {
        Image(systemName: "heart.fill")
          .foregroundStyle(.red)
          .font(.title)
          .padding()
      }
      if showText {
        Text(text)
          .padding(.trailing, 24)
      }
    }
    .clipShape(.capsule)
    .background(
      .regularMaterial.shadow(.drop(radius: 16)),
      in: .capsule
    )
    .frame(height: 50)
    .onAppear {
      Task {
        showIcon = true
        try await Task.sleep(for: .seconds(1))
        showText = true
        try await Task.sleep(for: .seconds(1))
        showText = false
        try await Task.sleep(for: .seconds(1))
        showIcon = false
      }
    }
  }
}

private struct RefreshPreview: View {
  var text: String

  @State private var id = false

  var body: some View {
    Message(text: text)
      .id(id)

    Button("Refresh") {
      id.toggle()
    }
    .buttonStyle(.borderedProminent)
  }
}

#Preview {
  RefreshPreview(text: "Hello, world !!!")
    .padding()
    .frame(maxWidth: .infinity)
}

🤔 アニメーションとトランジションを組み合わせて使う

こんなに雰囲気変わるようです。

sc 2024-08-22 at 21.49.39.gif

これは、組み合わせて使ったほうがいいですね!

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