Xcode14开发iOS应用运行后先显标签再黑屏求助

我正在用Xcode 14开发一款新iOS应用，已经创建了主故事板，并且在ViewController上添加了一个标签。但运行应用时，标签只会先显示一秒钟，之后屏幕就变黑了，而且没有任何报错信息。

我尝试过在AppDelegate中添加var window: UIWindow?，但应用还是会出现黑屏问题。

以下是我的代码，恳请帮忙解决：

AppDelegate代码 #

import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

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

    func applicationWillTerminate(_ application: UIApplication) {
        self.saveContext()
    }

    // MARK: - Core Data stack
    lazy var persistentContainer: NSPersistentContainer = {
        let container = NSPersistentContainer(name: "DataModel")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()

    // MARK: - Core Data Saving support
    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }
}

SceneDelegate代码 #

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()
    }
}

内容的提问来源于stack exchange，提问作者StalicJi