MPMoviePlayerController - 加载电影时捕获网络错误
有没有办法捕获异常（特别是网络错误 /没有可用的连接）当使用 MPMoviePlayerController 时？
我特别担心的是，一旦使用 initWithURL: 初始化播放器实例，您就无法知道电影加载是否由于某种原因失败。
我已经查看了可用的文档并意识到我可以获得 通过问题来通知 loadState 更改
moviePlayerLoadStateChanged:(NSNotification*)notification.
是可用的 loadState 常量不适合错误处理：（
MPMovieLoadStateUnknown
MPMovieLoadStatePlayable
MPMovieLoadStatePlaythroughOK
MPMovieLoadStateStalled
如果您想知道，MPMovieLoadStateStalled 由于某种原因在网络错误期间不会调用它？）
有一个已弃用的 MPMoviePlayerContentPreloadDidFinishNotification 提供了一个带有“error”键的 userInfo 字典，但对于 iOS 3.2 及更高版本没有任何内容。
任何帮助将非常感激。
Is there a way of catching exceptions (particularly for network errors
/ no connection available) when using a MPMoviePlayerController?
I am particularly concerned that once an instance of the player is initialised with initWithURL: you have no way of knowing whether the movie load has failed for some reason.
I have reviewed the available documentation and realise I can get a
notification for loadState changes through
moviePlayerLoadStateChanged:(NSNotification*)notification.
Problem is the loadState constants available don't cater for error handling:
MPMovieLoadStateUnknown
MPMovieLoadStatePlayable
MPMovieLoadStatePlaythroughOK
MPMovieLoadStateStalled
(in case you are wondering, MPMovieLoadStateStalled this doesn't get called during network errors for some reason?)
There's a deprecated MPMoviePlayerContentPreloadDidFinishNotification that provides a userInfo dictionary with an "error" key but nothing for iOS 3.2 and above.
Any help would be very much appreciated.
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最后，我通过订阅 MPMoviePlayerPlaybackDidFinishNotification 并观察 MPMovieFinishReasonPlaybackError 来排序。
更多详细信息请参见https://developer.apple.com/library/ios/documentation/MediaPlayer/Reference/MPMoviePlayerController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006953-CH3-SW17
In the end I got this sorted by subscribing to MPMoviePlayerPlaybackDidFinishNotification and watching for MPMovieFinishReasonPlaybackError.
More details here https://developer.apple.com/library/ios/documentation/MediaPlayer/Reference/MPMoviePlayerController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006953-CH3-SW17