I found a method to play YouTube video on MPMoviePlayerController. For this simply need a right url. That url may be obtained after playing YouTube video in iframe. My UIWebView uses this html:
<html>
<head>
</head>
<body style="margin:0">
<iframe class="youtube-player" type="text/html" width="280"
height="200" src="http://www.youtube.com/embed/VJRKaQ52ImE"
frameborder="0">
</iframe>
</body>
So after click on play in video rect, we can see msg in console like this:
YT_Player[1520:207] setting movie path: http://v12.lscache4.c.youtube.com/videoplayback?sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Cratebypass%2Coc%3AU0hQR1NLVl9FSkNOMF9LRVpB&fexp=913518%2C904531%2C910211&itag=18&ip=0.0.0.0&signature=93772DDEDFE678D8EA1A2E4669B5634BD6D4E81E.58DEF5203DEF07FB75F762D6C9C39536C84DE59C&sver=3&ratebypass=yes&expire=1312308000&key=yt1&ipbits=0&id=54944a690e762261
So here the question is - how get YT_Player object or how to generate "right" url?
There is no official API to get the "right" url, and likely there never will be. See the following link on the bottom.
http://groups.google.com/group/youtube-api-gdata/browse_thread/thread/394c41dda8b4745a
Note that your method based on UIWebView does not play the movie in MPMoviePlayerController, but rather in a custom class called YTMoviePlayer. You can confirm it by playing a movie and then dumping the subview hierarchy starting at [[UIApplication sharedApplication] keyWindow].
For me this library did work perfectly! https://github.com/hellozimi/HCYoutubeParser
来源：https://stackoverflow.com/questions/6911171/mpmovieplayercontroller-is-playing-youtube-video