Custom navigation swiftui

The result navigation

 @State var route : Router = .empty
 var body: some View {
 NavigationView{
 VStack{
 Button("go1") { route = .go1}
 Button("go2") { route = .go2}
 Button("go3") { route = .go3}
 }.navigation(route: $route)
 
 }.navigationViewStyle(.stack)
 }

1. Define sub view

struct SubView: View {
 let text: String
 var body: some View {
 Text("\(text)")
 }
}

2. Define routes

enum Router {
 case go1
 case go2
 case go3
 case empty
 @ViewBuilder
 var builder: some View {
 switch(self) {
 case .go1: SubView(text: "go1")
 case .go2: SubView(text: "go2")
 case .go3: SubView(text: "go3")
 default: EmptyView()
 }
 }
}

3. Define view modifier

struct NavigationModifire : ViewModifier{
 
 @State var isActive : Bool = true
 
 @Binding var route : Router
 
 func body(content: Content) -> some View {
 content
 .background{
 NavigationLink(destination : route.builder, isActive: $isActive ){
 EmptyView()
 }.hidden()
 }
 .onChange(of: isActive){
 if 0ドル == false { route = .empty }
 }
 }
 
}
extension View{
 @ViewBuilder
 func navigation(route : Binding<Router>) -> some View{
 if route.wrappedValue != .empty{
 modifier(NavigationModifire(route: route))
 }else { self }
 }
}