UpdatedAppDelegateMethod.swift

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