Question

我的列表单元格中有两个NavigationLink

我想在单击一次时转到目标1，然后在单击两次时转到目标2。因此，我添加了两个轻击手势来控制导航。

但是当我点击时，有两个问题：

1轻击手势块不会被调用。
2即使两个导航链接位于TextView后面，它们也会自动激活。真正的效果是：点击单元格->转到Destination1->回到家->转到Destination2->回到家

这是我的代码：

struct MultiNavLink: View {
    @State var mb_isActive1 = false;
    @State var mb_isActive2 = false;
    
    var body: some View {
        return
            NavigationView {
                List {
                    ZStack {
                        NavigationLink("", destination: Text("Destination1"), isActive: $mb_isActive1)
                        NavigationLink("", destination: Text("Destination2"), isActive: $mb_isActive2)
                        Text("Single tap::go to destination1\nDouble tap,go to destination2")
                    }
                    .onTapGesture(count: 2, perform: {()->Void in
                        NSLog("Double tap::to destination2")
                        self.mb_isActive2 = true
                    }).onTapGesture(count: 1, perform: {()->Void in
                        NSLog("Single tap::to destination1")
                        self.mb_isActive1 = true
                    })
                }.navigationBarTitle("MultiNavLink",displayMode: .inline)
        }
    }
}

我尝试删除List元素，然后一切按预期进行。似乎是List元素使一切变得奇怪。

我发现了这个问题：SwiftUI - Two buttons in a List，但情况与我不同。

期待您的回答，非常感谢...

Answer 1

尝试以下方法-想法是将链接隐藏在可见内容的背景中，并使它们对于UI无效，但通过编程方式激活。

通过Xcode 12 / iOS 14测试。

struct MultiNavLink: View {

    var body: some View {
        return
            NavigationView {
                List {
                    OneRowView()
                }.navigationBarTitle("MultiNavLink", displayMode: .inline)
        }
    }
}

struct OneRowView: View {
    @State var mb_isActive1 = false
    @State var mb_isActive2 = false

    var body: some View {
        ZStack {
            Text("Single tap::go to destination1\nDouble tap,go to destination2")
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .contentShape(Rectangle())
        .background(Group {
            NavigationLink(destination: Text("Destination1"), isActive: $mb_isActive1) {
                    EmptyView() }
                .buttonStyle(PlainButtonStyle())
            NavigationLink(destination: Text("Destination2"), isActive: $mb_isActive2) {
                    EmptyView() }
                .buttonStyle(PlainButtonStyle())
        }.disabled(true))
        .highPriorityGesture(TapGesture(count: 2).onEnded {
            self.mb_isActive2 = true
        })
        .onTapGesture(count: 1) {
            self.mb_isActive1 = true
        }
    }
}

Answer 2

导航链接具有一个初始化器，该初始化器采用绑定selection，并且只要将selection设置为NavigationLink tag的值，就会触发导航链接。提示：如果应用无法区分和识别您的点击，即使有两次点击，仍然会触发一次点击的动作，那么您可以使用同时手势（.simultaneousGesture()）修饰符代替普通手势（.gesture()）修饰符。

struct someViewName: View {
    
    @State var navigationLinkTriggererForTheFirstOne: Bool? = nil
    @State var navigationLinkTriggererForTheSecondOne: Bool? = nil
    
    var body: some View {
        VStack {
            NavigationLink(destination: SomeDestinationView(),
                           tag: true,
                           selection: $navigationLinkTriggererForTheFirstOne) {
                EmptyView()
            }
            
            NavigationLink(destination: AnotherDestinationView(),
                           tag: true,
                           selection: $navigationLinkTriggererForTheSecondOne) {
                EmptyView()
            }
            
            NavigationView {
                    Button("tap once to trigger the first navigation link.\ntap twice to trigger the second navigation link.") {
                        // tap once
                        self.navigationLinkTriggererForTheFirstOne = true
                    }
                    .simultaneousGesture(
                        TapGesture(count: 2)
                            .onEnded { _ in
                                self.navigationLinkTriggererForTheSecondOne = true
                            }
                    )
            }
        }
    }
}

SwitUI-列表中有两个NavigationLink

2 个答案: