SceneDelegate.swift of Storyboard project

SceneDelegate.swift

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let _ = (scene as? UIWindowScene) else { return }
    }

    func sceneDidDisconnect(_ scene: UIScene) {}

    func sceneDidBecomeActive(_ scene: UIScene) {}

    func sceneWillResignActive(_ scene: UIScene) {}

    func sceneWillEnterForeground(_ scene: UIScene) {}

    func sceneDidEnterBackground(_ scene: UIScene) {
        (UIApplication.shared.delegate as? AppDelegate)?.saveContext()
    }


}