import UIKit @main class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? } extension AppDelegate { func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { let vc = UIViewController() vc.view.backgroundColor = .white window = UIWindow(frame: UIScreen.main.bounds) window?.rootViewController = vc window?.makeKeyAndVisible() return true } } extension AppDelegate { private func setupMemory() { /* let w = Converter.World(converterModel) converterS = Converter.Service(w) */ } }