Objective c MPMoviePlayerViewController帧大小

我有这个方法：

-(void) playMov: (NSString*) title{
 //   play a movie!!
NSString *movpath = [[NSBundle mainBundle] pathForResource:title ofType:@"mp4"];
self.mpviewController =[[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL fileURLWithPath:movpath]];

[self.mpviewController.view setFrame: CGRectMake(0, 0, self.view.frame.size.width, 275)];

self.mpviewController.view.backgroundColor = [UIColor clearColor];
[self.mpviewController.view setBackgroundColor:[UIColor clearColor]];

[self.view addSubview:mpviewController.view];


 MPMoviePlayerController *mp = [mpviewController moviePlayer];
mp.contentURL = [NSURL fileURLWithPath:movpath];
 CGRect playerFrame = CGRectMake(0, 0, self.view.frame.size.width, 275);

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerPlaybackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:mp];

 [mp.view setFrame:playerFrame];
 mp.view.backgroundColor = [UIColor clearColor];
 [mp prepareToPlay];
 [[mpviewController moviePlayer] play];  
}

第一次加载视图时，它是黑色背景的全屏视图。 第一次之后是在想要的大小（0，0，self.view.frame.size.width，275）上仍然是黑色背景。 我希望它是这样的大小和清晰的背景色每一次

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有什么想法吗？

尝试使用

MPMoviePlayerController

类的

backgroundView

属性。

UIImageView*imgView=[[UIImageView alloc]initWithImage:backimage]；[[mp backgroundView]添加子视图：imgView]；工作：）