带滑出菜单的SwiftUI导航

Question

我有一个SwiftUI应用程序，但无法使导航正常工作。凡是接近工作的东西都感觉被黑了。我有一个跟随this tutorial. The slide-out menu looks like this.制作的滑出菜单，当从滑出菜单中选择一个项目时，我还想显示多个视图。 I want it to appear like this.我的菜单有一个类，如下所示。

enum menuItems {
    case Subview1
    case Subview2
    case Subview3
    case Subview4
    case Subview5
}

class SideMenu: ObservableObject {
    @Published var show: Bool = false
    @Published var selection: menuItems = menuItems.Events
}

然后我的ContentView如下所示

struct ContentView: View {
    @EnvironmentObject var menu: SideMenu
    var body: some View {
        GeometryReader { geometry in
            MainView()
            .frame(width: geometry.size.width, height: geometry.size.height)
                .offset(x: self.menu.show ? geometry.size.width/2 : 0)
            .disabled(self.menu.show ? true : false)
            if self.menu.show {
                MenuView()
                    .frame(width: geometry.size.width/2)
                    .transition(.move(edge: .leading))
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

struct MainView: View {
    @EnvironmentObject var menu: SideMenu
    var featureDetailView: some View {

        switch menu.selection {
        case menuItems.Subview1:
            return AnyView(Subview1())
        case menuItems.Subview2:
            return AnyView(Subview2())
        case menuItems.Subview3:
            return AnyView(Subview3())
        case menuItems.Subview4:
            return AnyView(Subview4())
        case menuItems.Subview5:
            return AnyView(Subview5())
        }
    }

    var body: some View {
        NavigationView {
            featureDetailView
                .navigationBarTitle(Text("Subview 1 Title"), displayMode: .inline)
                .navigationBarItems(leading: (
                    Button(action: {
                        withAnimation {
                            self.menu.show.toggle()
                        }
                    }) {
                        Image(systemName: "line.horizontal.3")
                            .imageScale(.large)
                            .foregroundColor(.white)
                    }
                ))
                .background(NavigationConfigurator { nc in
                    nc.navigationBar.barTintColor = .systemBlue
                    nc.navigationBar.titleTextAttributes = [.foregroundColor : UIColor.white]
                })
            }
        .navigationViewStyle(StackNavigationViewStyle())
    }
}

struct MainView_Previews: PreviewProvider {
    static var previews: some View {
        MainView()
    }
}

因此，ContentView负责显示MainView或滑出菜单。然后MainView将基于menu.selection的值显示正确的子视图。所有这些都有效，但是处理导航时比较麻烦，我想知道是否有更好的方法吗？当显示另一个子视图时，我也无法更改navigationBarTitle。