tabView 中的 SwiftUI navigationStack

Question

我有一个关于 IOS 16 中新的 NavigationStack 的问题。我在 ContentView 中设置 navigationTitle 时遇到问题，我设置了 navigationTitle 但它对所有选项卡都是相同的。我可以以某种方式设置它，以便我可以为每个不同的选项卡编辑它吗？使用标签？非常感谢

struct ContentView: View {
@State var selection = 1
var body: some View {
    NavigationStack {
        TabView(selection: $selection) {
            LaunchView()
                .badge(2)
                .tabItem {
                    Label("Received", systemImage: "tray.and.arrow.down.fill")
                }
                .tag(1)
            DeView()
                .tabItem {
                    Label("Sent", systemImage: "tray.and.arrow.up.fill")
                }
                .tag(2)
            DeView()
                .tabItem {
                    Label("Sent", systemImage: "tray.and.arrow.up.fill")
                }
                .tag(3)
        }
        .navigationTitle("test")
    }
}

}

Answer 1

您可以创建一个返回每个选择的标题的函数：

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func title() -> String {\n    if selection == 1 {\n        return title\n    }else if selection == 2 {\n        return some Title\n    }else if selection == 3 {\n        return some other Title\n    }\n} \n

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或者我个人最好的办法：Enums！

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创建一个包含选项卡的枚举，然后为每个选项卡创建一个标题属性：

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struct ContentView: View {\n    @State var selection = Tab.received\n    var body: some View {\n        NavigationStack {\n            TabView(selection: $selection) {\n                Text("hello")\n                    .badge(2)\n                    .tabItem {\n                        Label("Received", systemImage: "tray.and.arrow.down.fill")\n                    }\n                    .tag(Tab.received)\n                Text("hello3")\n                    .tabItem {\n                        Label("Sent", systemImage: "tray.and.arrow.up.fill")\n                    }\n                    .tag(Tab.sent)\n                Text("hello5")\n                    .tabItem {\n                        Label("Sent", systemImage: "tray.and.arrow.up.fill")\n                    }\n                    .tag(Tab.sennt)\n                    \n            }.navigationTitle(selection.title)\n        }\n    }\n}\n\nenum Tab: Int {\n    case received = 1\n    case sent = 2\n    case sennt = 3\n    var title: String {\n        switch self {\n            case .received:\n            return "Hello"\n            case .sent:\n            return "Hello World"\n            case .sennt:\n            return "Hello, World!"\n        }\n    }\n}\n

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另外，它\xe2\x80\x99s 比 s 更容易使用Int。

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编辑：隐藏 TabBar DeviceView：

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struct Test: View {\n    @State var selection = 1\n    @State var devicePresented = false\n    var body: some View {\n        NavigationStack {\n            //Content\n            .navigationDestination(isPresented: $devicePresented) {//present DeviceView when devicePresented is true\n                DeviceView()\n            }\n        }\n    }\n}\n\nstruct SettingsView: View {\n    @Binding var devicePresented: Bool\n    var body: some View {\n        List {\n            Button(action: {\n                devicePresented.toggle()\n            }) {\n                Text("Go to device")\n            }\n        }\n    }\n}\n

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