运行应用程序中的黑色屏幕

Question

在这里输入图像描述

我正在尝试用Xcode开发一个新的iOS应用程序。我制作了一个主要的故事板，并在我的ViewController上添加了一个标签。当我运行我的应用程序时，首先它会显示标签，然后变成黑色屏幕，没有任何错误。

我在做Xcode 14

我尝试添加(var窗口: UIWindow?)在我的AppDelegate，但应用程序仍然崩溃。

这是我的密码，请帮我：

AppDelegate

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

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()
}


}

Answer 1

试着添加

var window: UIWindow?

你的应用程序代表