iOS - Xcode工程可以运行成功，但是一直处于黑屏状态

·引起黑屏现象的原因：

 ​​​​​​​项目中不使用Scene（多页面分屏）时，没有完全删除工程中的相关代码

·解决方案如下：

步骤一：删除SceneDelegate文件

 步骤二：删除AppDelegate中，有关Scene的两个方法，如下所示：

// 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.
}

 步骤三：删除Info文件中，Scene的配置项

·结果：项目运行成功，页面展示正常