Swift: iOS Programmatic UI

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