即使添加了SceneDelegate并更新了Info.plist，Xcode 11上的iOS13还是黑屏

Question

[我目前在Xcode 11，Target iOS 13.0上出现黑屏（该应用程序在所有低于iOS 12.1至12.4的版本中均能正常工作，我想让我的应用程序对12.1以上的iOS用户以及当前正在使用13.0的iOS用户都适用屏幕将以下SceneDelegate添加到我现有的项目中，并且

添加App Manifest文件

import UIKit
    import SwiftUI

    @available(iOS 13.0, *)
    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 }

            let user  = UserDefaults.standard.object(forKey: "defaultsuserid")

            let userSelfIdent  = UserDefaults.standard.object(forKey: "userinitialident")

            if let windowScene = scene as? UIWindowScene {

                let internalWindow = UIWindow(windowScene: windowScene)

                if (user != nil && userSelfIdent != nil){
                     let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
                     let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
                        internalWindow.rootViewController = newViewcontroller
                        self.window = internalWindow
                        internalWindow.makeKeyAndVisible()
                }else {

                    guard let _ = (scene as? UIWindowScene) else { return }
                }
            }
        }

以下是我的AppDelegate，它将首先被调用并执行didFinishLaunchWithOptions方法。我想知道仅当我的Target ios小于13.0时才能调用此方法，并在13.0之后调用SceneDelegate方法初始化rootViewController吗？

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    @available(iOS 13.0, *)
    func application(_ application: UIApplication,
                     configurationForConnecting connectingSceneSession: UISceneSession,
                     options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    @available(iOS 13.0, *)
    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {

    }



    @available(iOS 13.0, *)
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        guard let _ = (scene as? UIWindowScene) else { return }

        if (user != nil && userSelfIdent != nil){

              let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
              let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
                self.window?.rootViewController = newViewcontroller
        }
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        Thread.sleep(forTimeInterval: 3.0)

        UINavigationBar.appearance().barTintColor = UIColor(red:0.08, green:0.23, blue:0.62, alpha:1.0)

        if (user != nil && userSelfIdent != nil){

              let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
              let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
                self.window?.rootViewController = newViewcontroller
        }

        return true
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

        let defaultUserID = UserDefaults.standard.string(forKey: "defaultUserID")


    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

        switch (application.applicationState) {
        case UIApplicationState.active:
            do something

        case UIApplicationState.background, UIApplicationState.inactive:

            let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let newViewcontroller = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
            self.window?.rootViewController = newViewcontroller            
        }
    }

Answer 1

您在这里遇到几个问题。阅读与应用程序生命周期相关的文档非常重要，该文档阐明了iOS 13下的内容以及iOS 12下的内容。