问题：
在视频播放时，现在控制条采用磨砂的效果，会遮罩部分视频
解决思路
1 播放器直接设置不带控制条，在app在 Foreground状态，默认播放器暂停，这样需要在获得Foreground事件，进行设置播放
- (void) viewWillAppear:(BOOL)animated{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForegroundNotification) name:UIApplicationWillEnterForegroundNotification object:nil];
}
- (void) appWillEnterForegroundNotification{
NSLog(@"trigger event when will enter foreground.");
}
-(void) viewDidDisappear:(BOOL)animated{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
2 直接侦听播放器准备播放通知，在通知中设置播放器带控制条
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:)
name:MPMoviePlayerReadyForDisplayDidChangeNotification
object:player];
- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
player.controlStyle =MPMovieControlStyleEmbedded;
[[NSNotificationCenter defaultCenter]removeObserver:self name:MPMoviePlayerReadyForDisplayDidChangeNotification object:player];
}