如何将动作绑定到导航视图返回按钮？

发布于 2025-01-20 18:34:56 字数 505 浏览 4 评论 0原文

我想将动作绑定到导航视图工具栏中的后退按钮，是否有可能？

var body: some View {
     List {
          ForEach(mainViewModel.items) { item in
              NavigationLink(destination: EditTaskView(item: item)) {
                  HStack {
                      ListRowView(item: item)
                  }
              }
         }
     }
}

原文

I would like to bind an action to the Back button in the navigationview toolbar, is it possible?

var body: some View {
     List {
          ForEach(mainViewModel.items) { item in
              NavigationLink(destination: EditTaskView(item: item)) {
                  HStack {
                      ListRowView(item: item)
                  }
              }
         }
     }
}

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本王不退位尔等都是臣 2025-01-27 18:34:56

您不能直接绑定到后退按钮，但您可以根据状态激活导航链接本身，然后像这样监听状态值的变化。请注意，这要求您将状态设置管理为 true（不像默认初始化程序那样自动点击）

struct ContentView: View {
  @State private var showingNavView = false
  var body: some View {
    NavigationView {
      List {
        NavigationLink("Sub View", isActive: $showingNavView) {
          SubView()
        }.onTapGesture {
          showingNavView = true
        }.onChange(of: showingNavView) { newValue in
          print(newValue) // Will change to false when back is pressed
        }
      }
    }
  }
}
struct SubView: View {
  var body: some View {
    ZStack {
      Color.green
      Text("Cool Beans")
    }
  }
}

You can't bind directly to the back button, but you can have the navigation link itself be activated based on state, and then listen to the change of the state value like so. Do note that this requires that you manage the setting of state to true (no auto tap like with the default initializer)

struct ContentView: View {
  @State private var showingNavView = false
  var body: some View {
    NavigationView {
      List {
        NavigationLink("Sub View", isActive: $showingNavView) {
          SubView()
        }.onTapGesture {
          showingNavView = true
        }.onChange(of: showingNavView) { newValue in
          print(newValue) // Will change to false when back is pressed
        }
      }
    }
  }
}
struct SubView: View {
  var body: some View {
    ZStack {
      Color.green
      Text("Cool Beans")
    }
  }
}

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