释放 LongPressGesture SwiftUI 时触发动作

Question

当我在 minimumDistance 内释放 LongPressGesture 时，我试图触发“按下”消息，但是当我长按图像时，此代码会立即打印出消息。我该如何解决这个问题？

struct ContentView: View {
    @GestureState private var isDetectingPress = false
    
    var body: some View {
        Image(systemName: "trash")
            .resizable().aspectRatio(contentMode: .fit)
            .frame(width: 100, height: 100)
            .scaleEffect(isDetectingPress ? 0.5 : 1)
            .animation(.easeInOut(duration: 0.2))
            .gesture(LongPressGesture(minimumDuration: 0.01).sequenced(before:DragGesture(minimumDistance: 100).onEnded {_ in
                print("Ended")
            })
                .updating($isDetectingPress) { value, state, _ in
                    switch value {
                    case .second(true, nil):
                        state = true
                        // The message below should be printed when I release the long press
                        print("pressed")
                    case .second(true, _):
                        state = false
                        break
                    default:
                        break
                    }
            })
    }
}

Answer 1

您可以尝试以下方法：

struct ContentView: View {
    var body: some View {
        Button(action: {
            print("Pressed")
        }) {
            Image(systemName: "trash")
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(width: 100, height: 100)
        }
        .buttonStyle(ScalableButtonStyle())
    }
}

struct ScalableButtonStyle: ButtonStyle {
    let scaleWhenPressed: CGFloat = 0.75

    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .scaleEffect(configuration.isPressed ? scaleWhenPressed : 1.0)
    }
}