gistfile1.txt

@UIApplicationMain class AppDelegate: UIResponder,
UIApplicationDelegate, UINavigationControllerDelegate {
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        if let window = window {
            let vc = MyViewController(nibName: nil, bundle: nil)
            let nav = UINavigationController(rootViewController: vc)
            window.rootViewController = nav
            window.makeKeyAndVisible()
        }
        return true
    }
}