SwiftUI文字消失在导航栏后面

Question

我遇到一个问题，我的文本在导航栏后面消失了。用户单击“设置”（或任何其他菜单按钮）后，导航栏将变为可见。它会显示出来并且内容可见，但是在完成加载新视图后，文本会消失在栏后面。有什么办法吗？

我更改了导航栏的状态，该导航栏的显示级别是根级视图的.onAppear和.onDisappear。

编写如下代码：

struct ContentView: View {

    @State public var navBarHidden = true

    var body: some View {

        NavigationView{
            VStack{
                ZStack(alignment: .center){
                    WhiteImage().onAppear{self.navBarHidden = true} //Here only seen as white background
                    BottomButtons().onDisappear{self.navBarHidden = false}
                    ProfileInvoke().navigationBarTitle("").navigationBarHidden(self.navBarHidden)
                }
            }
        }
    }
}

//The buttons are done with such a construct

struct MenuButton: View {

    var buttonText: String
    var buttonCallView: AnyView

    var body: some View {
        NavigationLink(destination: self.buttonCallView) {
            Text(self.buttonText)
        }.padding()

    }
}

//Population of a button

MenuButton(buttonText: "My Favourites", buttonCallView: AnyView(MyFavouritesView().navigationBarTitle(Text("My Favourites"), displayMode: .inline)))


// The settings view where the title disappears 

struct SettingsView: View {

    var body: some View {
        HStack(alignment: .top){
            VStack(alignment: .leading){
                Text("General").bold()
                Divider()
                Spacer()
            }.padding()
            Spacer()
        }
    }
}

我觉得这与.onAppear和.onDisappear有关，在这里我将导航栏的状态设置为隐藏还是不隐藏。不确定