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import UIKit

class ViewController: UIViewController {

    override func loadView() {

        view = UIView()

        view.backgroundColor = .systemBlue

    }

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

}

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class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.

        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.

        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

        guard let windowScene = (scene as? UIWindowScene) else { return }

        let window = UIWindow(windowScene: windowScene)

        window.rootViewController = ViewController()

        self.window = window

        window.makeKeyAndVisible()

    }

 ...

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import UIKit

@main

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

    func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow(frame: UIScreen.main.bounds)

        window?.rootViewController = ViewController()

        window?.makeKeyAndVisible()

        return true

    }

...