在 navigationView、SwiftUI 上创建一个视图

Question

I'm creating a view embedded in a ZStack, something like this:

ZStack(alignment: .top) {
        
    content
        
        if self.show {
                                
                VStack {
                    
                    HStack {

This is a viewModifier so I call this in my main view with for example: .showView() .

But what happened is that if I have a NavigationView, this view is only showing below the navigationView. (I have a navigationViewTitle that is over my view).

How can I solve this problem? I was thinking about some zIndex but it is not working. I thought also about some better placement of this .showView(), but nothing to do.

Answer 1

Here is a demo of possible approach (it can be added animations/transitions, but it is out of topic). Demo prepared & tested with Xcode 11.4 / iOS 13.4

struct ShowViewModifier<Cover: View>: ViewModifier {
    let show: Bool
    let cover: () -> Cover

    func body(content: Content) -> some View {
        ZStack(alignment: .top) {
            content
            if self.show {
                cover()
            }
        }
    }
}

struct DemoView: View {
    @State private var isPresented = false
    var body: some View {
        NavigationView {
            VStack {
                NavigationLink("Link", destination: Button("Details")
                    { self.isPresented.toggle() })
                Text("Some content")
                    .navigationBarTitle("Demo")
                Button("Toggle") { self.isPresented.toggle() }
            }
        }
        .modifier(ShowViewModifier(show: isPresented) {
            Rectangle().fill(Color.red)
                .frame(height: 200)
        })
    }
}

backup