Add navigation Stack programatically Swift

NavigationStack_AppDelegate_SceneDelegate.swift

// APPDELEGATE:

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.makeKeyAndVisible()
    let nvc = UINavigationController(rootViewController: ViewController())
    window?.rootViewController = nvc
    return true
  }


// SCENEDELEGATE:

@available(iOS 13.0, *)
class SceneDelegate: UIResponder, UIWindowSceneDelegate {

  var window: UIWindow?

  func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    guard let windowScene = (scene as? UIWindowScene) else { return }
    window = UIWindow(windowScene: windowScene)
    window?.makeKeyAndVisible()
    let nvc = UINavigationController(rootViewController: ViewController())
    window?.rootViewController = nvc
  }
}