SwiftUI

Question

我的列表的一个单元格中有两个 NavigationLink

我想点击一次去目的地1，点击两次去目的地2。所以我添加了两个点击手势来控制导航。

但是点击的时候有两个问题：

1 点按手势块不会被调用。
2 两个导航 link 即使在 TextView 后面也会自动激活。实际效果是：点击cell -> 去Destination1 -> 回到home -> 去Destination2 -> 回到home

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)
        }
    }
}

我试过删除列表元素，然后一切如我所料。好像是List元素让一切变得奇怪

我发现了这个问题：，但是情况和我不一样

期待您的回答，非常感谢...

Answer 1

导航 link 有一个接受绑定 selection 的初始化程序，只要 selection 设置为 NavigationLink tag 的值，导航 link 将触发。作为提示，如果应用程序无法区分和识别您的点击，即使点击两次，仍然会触发 one-tap 的动作，那么您可以使用同步手势（.simultaneousGesture()）修饰符而不是正常的手势（.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
                            }
                    )
            }
        }
    }
}

Answer 2

尝试以下方法 - 这个想法是在可见内容的背景中隐藏链接并使它们在 UI 内处于非活动状态，但以编程方式激活。

测试 Xcode 12 / iOS 14.

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
        }
    }
}

SwiftUI - 列表中的两个导航链接

SwitUI - Two navigationLink in a list

list

ios

vstack

swiftui-navigationlink