呈现模态视图控制器 (MPMoviePlayerViewController) 时出现问题
我的应用程序启动，并且我有一个 UITabBarController。在第一个选项卡上，我有一个 UIViewController 的子类。正是在这个类中，我拥有了电影播放功能。我不知道为什么，但是从这个类中，我无法presentModalViewController或presentMoviePlayerViewControllerAnimated。不过，我可以将视图添加为子视图。我找到了这篇文章，这本质上就是我想要做的（呈现一个电影播放器视图控制器）：如何从 UITabBarController 呈现 MPMoviePlayerViewController？
但即使保留对 UITabBarController 的引用对我来说也不起作用。我不太确定为什么这个类在呈现模态视图控制器时存在问题，而在其他选项卡中，我能够做到。有什么想法吗？谢谢。
My App starts up, and I have a UITabBarController. On the first tab I have a subclass of UIViewController. It's in this class that I have my movie playing functionality. I do not know why, but from this class, I cannot presentModalViewController or presentMoviePlayerViewControllerAnimated. I can however add views as a subView. I found this post, which is essentially what I'm trying to do (present a movie player view controller): How to present MPMoviePlayerViewController from a UITabBarController?
But even keeping a reference to the UITabBarController does not work for me. I'm not really sure why this class has problems presenting a modal view controller, versus in other tabs, I am able to. Any thoughts? Thanks.
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经过更多查看，我发现问题是我无法在 viewDidLoad 方法中以模态方式呈现视图。
After more looking, I found that the problem is I cannot present a view modally within the viewDidLoad method.