问题归结为更改,主要是对 iOS 13 及更高版本中的多个场景的支持。检查此reddit 链接以进行讨论。
解决方案是将一些东西从 AppDelegate 移动到 SceneDelegate。
这是上述两个类的基本部分的最终形式。
----场景委托
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
self.window = UIWindow(windowScene: windowScene)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let rootVC = storyboard.instantiateViewController(identifier: "ViewController") as? ViewController else {
print("ViewController not found")
return
}
//set the storage here
rootVC.container = (UIApplication.shared.delegate as? AppDelegate)?.persistentContainer
//I dont want a UI navigation controller.
//let rootNC = UINavigationController(rootViewController: rootVC)
//self.window?.rootViewController = rootNC
//I want to use my basic view controller here. use rootNC to get a UI navigation controller
self.window?.rootViewController = rootVC
self.window?.makeKeyAndVisible()
}
--AppDelegate(保持不变)
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
//before iOS 13 you would be putting stuff here but not anymore.
return true
}
最后,您将在 AppDelegate 本身中保留与存储相关的代码。