Views.swift

struct ModalView: View {
    var body: some View {
        NavigationView {
            VStack {
                Spacer()
                Text("ModalView")
                Spacer()
            }.modifier(RedNavigationBar(title: "Modal"))
        }
    }
}

struct ContentView: View {
    
    @State var presentedModal = false
    
    var body: some View {
        NavigationView {
            VStack {
                Spacer()
                Spacer()
                Text("ContentView")
                Spacer()
                Button(action: {
                    self.presentedModal = true
                }) {
                    Text("Present Modal")
                }
                Spacer()
                Spacer()
            }
            .modifier(GreenNavigationBar(title: "Content"))
            .sheet(isPresented: $presentedModal) {
                ModalView()
            }
        }
    }
}