SwiftUI禁用TabView中的特定tabItem选择吗？

Question

我有一个TabView，在点击[+]（第二个）tabItem后显示一张纸。同时，ContentView也在切换TabView的选项卡选择，因此当我关闭显示的工作表时，所选的选项卡是空白的，没有任何内容。并非理想的用户体验。

我的问题：

[我想知道如何才能简单地禁用特定的tabItem，使其不像一个选项卡那样，而只是在显示该表的同时保持在点击[+]项之前的选项卡选择。 SwiftUI可能实现这种效果，还是我应该通过另一种方式来实现这种效果？

我的标签栏的图像：

这是我的ContentView的代码，其中我的TabView是：

struct SheetPresenter<Content>: View where Content: View {
    @EnvironmentObject var appState: AppState
    @Binding var isPresenting: Bool

    var content: Content
    var body: some View {
        Text("")
            .sheet(isPresented: self.$isPresenting, onDismiss: {
                // change back to previous tab selection
                print("New listing sheet was dismissed")

            }, content: { self.content})
            .onAppear {
                DispatchQueue.main.async {
                    self.isPresenting = true
                    print("New listing sheet appeared with previous tab as tab \(self.appState.selectedTab).")
                }
            }
    }
}

struct ContentView: View {
    @EnvironmentObject var appState: AppState
    @State private var selection = 0
    @State var newListingPresented = false

    var body: some View {

        $appState.selectedTab back to just '$selection'
        TabView(selection: $appState.selectedTab){

            // Browse
            BrowseView()
                .tabItem {
                    Image(systemName: (selection == 0 ? "square.grid.2x2.fill" : "square.grid.2x2")).font(.system(size: 22))
                }
                .tag(0)


            // New Listing
            SheetPresenter(isPresenting: $newListingPresented, content: NewListingView(isPresented: self.$newListingPresented))
                .tabItem {
                    Image(systemName: "plus.square").font(.system(size: 22))
                }
                .tag(1)

            // Bag
            BagView()
                .tabItem {
                    Image(systemName: (selection == 2 ? "bag.fill" : "bag")).font(.system(size: 22))
                }
                .tag(2)

            // Profile
            ProfileView()
                .tabItem {
                    Image(systemName: (selection == 3 ? "person.crop.square.fill" : "person.crop.square")).font(.system(size: 22))
                }
                .tag(3)
        }.edgesIgnoringSafeArea(.top)
    }
}

这里是AppState：

final class AppState: ObservableObject {

    @Published var selectedTab: Int = 0
}

Answer 1

  struct SheetPresenter<Content>: View where Content: View {
@EnvironmentObject var appState: AppState
@Binding var isPresenting: Bool
  @Binding var showOtherTab: Int
var content: Content
var body: some View {
    Text("")
        .sheet(isPresented: self.$isPresenting, onDismiss: {
            // change back to previous tab selection
            self.showOtherTab = 0

        } , content: { self.content})
        .onAppear {
            DispatchQueue.main.async {
                self.isPresenting = true
                print("New listing sheet appeared with previous tab as tab \(self.appState.selectedTab).")
            }
        }
}
}

struct ContentView: View {
@EnvironmentObject var appState: AppState
@State private var selection = 0
@State var newListingPresented = false
var body: some View {

  //  $appState.selectedTab back to just '$selection'


    TabView(selection: $appState.selectedTab){

        // Browse

        Text("BrowseView") //BrowseView()
            .tabItem {
                Image(systemName: (selection == 0 ? "square.grid.2x2.fill" : "square.grid.2x2")).font(.system(size: 22))
            }
            .tag(0)


        // New Listing

        SheetPresenter(isPresenting: $newListingPresented,  showOtherTab: $appState.selectedTab, content: Text("1232"))//NewListingView(isPresented: self.$newListingPresented))
            .tabItem {
                Image(systemName: "plus.square").font(.system(size: 22))
            }
            .tag(1)

        // Bag
      //  BagView()
            Text("BAGVIEW")
            .tabItem {
                Image(systemName: (selection == 2 ? "bag.fill" : "bag")).font(.system(size: 22))
            }
            .tag(2)

        // Profile
         Text("ProfileView") //   ProfileView()
            .tabItem {
                Image(systemName: (selection == 3 ? "person.crop.square.fill" : "person.crop.square")).font(.system(size: 22))
            }
            .tag(3)
    }.edgesIgnoringSafeArea(.top)
}
}