当 TapGesture 也出现时，SwiftUI LongPressGesture 需要很长时间才能识别

Question

我想在同一项目上识别TapGesture和。LongPressGesture它工作正常，但有以下例外： the LongPressGesturealone 在我指定的持续时间后响应，即 0.25 秒，但是当我将它与 结合使用时TapGesture，至少需要 1 秒\xe2\x80\x94我找不到使其响应更快的方法。这是一个演示：

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这是它的代码：

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struct ContentView: View {\n    @State var message = ""\n\n    var body: some View {\n        Circle()\n            .fill(Color.yellow)\n            .frame(width: 150, height: 150)\n            .onTapGesture(count: 1) {\n                message = "TAP"\n            }\n            .onLongPressGesture(minimumDuration: 0.25) {\n                message = "LONG\\nPRESS"\n            }\n            .overlay(Text(message)\n                        .font(.title).bold()\n                        .multilineTextAlignment(.center)\n                        .allowsHitTesting(false))\n    }\n}\n

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请注意，除了长按的持续时间（远长于 0.25 秒）之外，它工作正常。

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有任何想法吗？提前致谢！

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Answer 1

为了拥有一些适合项目中每个人需求的多手势，Apple 没有提供比普通手势更好的功能，将它们混合在一起以达到所需的手势有时会很棘手，这是一个救赎，无需工作即可问题或错误！

这里有一个自定义的零问题手势，称为interactionReader，我们可以将其应用到任何View。同时拥有LongPressGesture和TapGesture。​

import SwiftUI

struct ContentView: View {
    
    var body: some View {
        
        Circle()
            .fill(Color.yellow)
            .frame(width: 150, height: 150)
            .interactionReader(longPressSensitivity: 250, tapAction: tapAction, longPressAction: longPressAction, scaleEffect: true)
            .animation(Animation.easeInOut(duration: 0.2))
        
    }
    
    func tapAction() { print("tap action!") }
    
    func longPressAction() { print("longPress action!") }
    
}

struct InteractionReaderViewModifier: ViewModifier {
    
    var longPressSensitivity: Int
    var tapAction: () -> Void
    var longPressAction: () -> Void
    var scaleEffect: Bool = true
    
    @State private var isPressing: Bool = Bool()
    @State private var currentDismissId: DispatchTime = DispatchTime.now()
    @State private var lastInteractionKind: String = String()
    
    func body(content: Content) -> some View {
        
        let processedContent = content
            .gesture(gesture)
            .onChange(of: isPressing) { newValue in
                
                currentDismissId = DispatchTime.now() + .milliseconds(longPressSensitivity)
                let dismissId: DispatchTime = currentDismissId
                
                if isPressing {
                    
                    DispatchQueue.main.asyncAfter(deadline: dismissId) {
                        
                        if isPressing { if (dismissId == currentDismissId) { lastInteractionKind = "longPress"; longPressAction() } }
                        
                    }
                    
                }
                else {
                    
                    if (lastInteractionKind != "longPress") { lastInteractionKind = "tap"; tapAction() }
                    
                    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(50)) {lastInteractionKind = "none"}
                    
                    
                }
                
            }
        
        return Group {
            
            if scaleEffect { processedContent.scaleEffect(lastInteractionKind == "longPress" ? 1.5: (lastInteractionKind == "tap" ? 0.8 : 1.0 )) }
            else { processedContent }
            
        }

    }
    
    var gesture: some Gesture {
        
        DragGesture(minimumDistance: 0.0, coordinateSpace: .local)
            .onChanged() { _ in if !isPressing { isPressing = true } }
            .onEnded() { _ in isPressing = false }
        
    }
    
}

extension View {
    
    func interactionReader(longPressSensitivity: Int, tapAction: @escaping () -> Void, longPressAction: @escaping () -> Void, scaleEffect: Bool = true) -> some View {
        
        return self.modifier(InteractionReaderViewModifier(longPressSensitivity: longPressSensitivity, tapAction: tapAction, longPressAction: longPressAction, scaleEffect: scaleEffect))
        
    }
    
}