Start iOS application without storyboard

create_app_without_storyboard.swift

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.makeKeyAndVisible()
        
        window?.rootViewController = UINavigationController(rootViewController: ViewController())
        
        
        return true
    }