iOS 15下@Binding控制NavigationLink返回失效问题排查

你当前的绑定逻辑只控制了SecondView到ThirdView的NavigationLink激活状态，但在FourthView中把shouldGoToSecond设为false时，仅会尝试弹出ThirdView，而FourthView仍留在导航栈中，所以无法直接回到SecondView。另外iOS15的NavigationView里，NavigationLink的isActive绑定仅对直接对应的目标视图生效，无法跨层级一次性弹出多个视图。

方案一：用presentationMode手动弹出两次 #

从FourthView回到SecondView需要连续弹出两个视图（Fourth→Third→Second），可以借助@Environment(\.presentationMode)实现异步两次dismiss：

struct ForthView: View {
    @Environment(\.presentationMode) var presentationMode
    var body: some View {
        VStack {
            Text("Hello, World")
            Button {
                // 先弹出当前的FourthView
                presentationMode.wrappedValue.dismiss()
                // 异步弹出ThirdView，确保第一次dismiss完成后执行
                DispatchQueue.main.async {
                    presentationMode.wrappedValue.dismiss()
                }
            } label: {
                Text("Go to Second")
            }
        }
    }
}

方案二：通过绑定控制各层级导航状态 #

给FourthView添加对ThirdView导航状态的绑定，依次关闭各层级的NavigationLink：

1. 修改ThirdView，将自身的导航状态绑定传递给FourthView：

struct ThirdView: View {
    @Binding var shouldGoToSecond: Bool
    @State private var isActive: Bool = false
    var body: some View {
        VStack {
            Text("Hello, World!")
            NavigationLink(destination: ForthView(shouldGoToSecond: $shouldGoToSecond, shouldGoToThird: $isActive), isActive: $isActive) {
                Button {
                    isActive = true
                } label: {
                    Text("Go to Forth")
                }
            }
        }
        .navigationTitle("Third")
    }
}

2. 修改FourthView，接收两个绑定并依次关闭：

struct ForthView: View {
    @Binding var shouldGoToSecond: Bool
    @Binding var shouldGoToThird: Bool
    var body: some View {
        VStack {
            Text("Hello, World")
            Button {
                // 先关闭FourthView对应的导航链接
                shouldGoToThird = false
                // 再关闭ThirdView对应的导航链接
                shouldGoToSecond = false
            } label: {
                Text("Go to Second")
            }
        }
    }
}

额外注意 #

确保你的根视图（比如FirstView）被包裹在NavigationView中，否则导航功能无法正常工作：

@main
struct YourApp: App {
    var body: some Scene {
        WindowGroup {
            NavigationView {
                FirstView()
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者Mrugesh Tank