SwiftUI ScrollView 也触发 DragGesture

Posted 2023-02-24

【中文标题】SwiftUI ScrollView 也触发 DragGesture

【英文标题】：SwiftUI ScrollView also triggering DragGesture

【发布时间】：2020-04-19 19:04:54

【问题描述】：

我正在制作用户用他们自己的内容填写的可滑动的闪存卡。该卡片包含一个垂直 ScrollView（用于文本）和水平 ScrollView（用于标签）。该卡还附加了一个拖动手势。但是，当我滚动浏览 ScrollViews 时，它也会触发 DragGesture 的 .onChanged（但也不会跟随 .onEnded）。如何在手势之前优先考虑 ScrollView？

struct ContentView: View 
    @State private var translation: CGSize = .zero

    var body: some View 
        GeometryReader  geometry in
            ZStack 
                Color(.blue).edgesIgnoringSafeArea(.all)

                VStack 
                    ScrollView 
                        Text("blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah")
                    
                    Tags(decks: ["Tag", "Tag", "Tag", "Tag", "Tag", "Tag", "Tag"])
                

                .padding(24)
                .frame(width: geometry.size.width - 48, height: geometry.size.height / 2)
                .background(Color.gray)
                .clipShape(RoundedRectangle(cornerRadius: 18, style: .continuous))
                .animation(.interactiveSpring(response: 0.5, dampingFraction: 0.75, blendDuration: 0))
                .offset(x: self.translation.width, y: self.translation.height)
                .gesture(DragGesture()
                    .onChanged  value in
                        self.translation = value.translation
                    .onEnded  value in
                        self.translation = .zero
                    )
            
        
    



struct ContentView_Previews: PreviewProvider 
    static var previews: some View 
        ContentView()
    


struct Tags: View 
    var decks: [String] = []

    var body: some View 
        ScrollView(.horizontal, showsIndicators: false) 
            HStack 
                ForEach(decks, id: \.self)  deck in
                    Text(deck)
                        .font(.system(size: 12, weight: .semibold))
                        .padding(.vertical, 6)
                        .padding(.horizontal, 12)
                        .background(Color.white)
                        .clipShape(Capsule())
                
            
        
    

【问题讨论】：

你找到解决这个问题的方法了吗？

@erkutbas 不幸的是我没有

【参考方案1】：

尝试使用手势修饰符，例如同时(with:)、sequential(before:) 或exclusive(before:) 来解决您的问题。

【讨论】：

如果我了解我在网上找到的内容，那是我自己实现的两个手势，但我只添加了一个 DragGesture。但是，我认为 ScrollView 内置了某种手势，但我不确定如何引用它以在您建议的修饰符中使用它。