1、Xcode 11.5去掉SceneDelegate

iOS13以下系统使用SceneDelegate黑屏，暂时删除之

1. info.plist中删除UIApplication Scene Manifest
2. 删除SceneDelegate.swift文件
3. 删除AppDelegate.swift文件中的方法（不删会黑屏）

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    
    
    
    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

4. 在AppDelegate.swift文件中定义window变量并赋值

    var window: UIWindow?


    //启动成功
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        sleep(2) //可以延长启动图显示时间，只能选择整数吗？？
        window = UIWindow.init()
        self.window?.frame = UIScreen.main.bounds
        //JBaseViewController是你自己的第一个控制器
        self.window?.rootViewController = JBaseViewController()
        self.window?.makeKeyAndVisible()
        return true
    }