NavigationStack

NavigationControllerApp.swift

class NavigationController: ObservableObject {
    @Published var path: NavigationPath = .init()
    var destinations: [UUID: () -> any View] = [:]

    func push(id: UUID = .init(), @ViewBuilder destination: @escaping () -> some View)  {
        destinations[id] = destination
        path.append(id)
    }
    func pop()  {
        path.removeLast()
    }
}

@main
struct NavigationDemoApp: App {
    @StateObject var navigationController = NavigationController()
    var body: some Scene {
        WindowGroup {
            NavigationStack(path: $navigationController.path) {
                ContentView()
                    .navigationDestination(for: UUID.self) { id in
                        if let destination = navigationController.destinations[id] {
                            AnyView(destination())
                        }
                    }
            }
            .environmentObject(navigationController)
        }
    }
}

// MARK: - Content Views
struct ContentView: View {
    @EnvironmentObject var navigationController: NavigationController
    var body: some View {
        VStack {
            Button {
                navigationController.push(destination: { ContentView2() })
            } label: {
                Text("ContentView2")
            }
        }
        .padding()
    }
}

struct ContentView2: View {
    @EnvironmentObject var navigationController: NavigationController
    var body: some View {
        VStack {
            Button {
                navigationController.push(destination: { ContentView3() })
            } label: {
                Text("ContentView3")
            }
        }
        .padding()
    }
}

struct ContentView3: View {
    @EnvironmentObject var navigationController: NavigationController
    var body: some View {
        VStack {
            Button {
                navigationController.pop()
            } label: {
                Text("pop")
            }
        }
        .padding()
    }
}