MPMoviePlayerViewController 問題

- (void)playVideo:(NSString*)url
{
    NSLog(@"play~");
    if(![PlayUrl isEqualToString:url]){
        
        playerViewController = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL fileURLWithPath:url]];  
        //playerViewController.moviePlayer.allowsAirPlay = YES;
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallback:)  
                                                     name:MPMoviePlayerPlaybackDidFinishNotification  
                                                   object:[playerViewController moviePlayer]];  
        PlayUrl=[url copy];
        //-- add to view--- 
        [self.view addSubview:playerViewController.view]; //sdl4.3使用正常
        //[self presentModalViewController:playerViewController animated:YES]; // sdk5.0使用正常

    }else{
        playerViewController.view.hidden=NO;
    }

}  
- (void) movieFinishedCallback:(NSNotification*) aNotification {  
    MPMoviePlayerController *player = [aNotification object];  
    [player pause];
    playerViewController.view.hidden=YES;//sdl4.3使用正常
    //[self dismissModalViewControllerAnimated:YES]; // sdk5.0使用正常
}


-(IBAction) pressedbutton:(id)sender
{
    NSLog(@"按到我了");
    NSString *url;
    switch ([sender tag]) {
        case 1:
            url = [[NSBundle mainBundle] pathForResource:@"張學友 - 明天我要嫁給你" ofType:@"mp4"]; 
            break;
            
        default:
            url = [[NSBundle mainBundle] pathForResource:@"video-2012-01-15-16-48-36" ofType:@"mp4"];
            break;
    }


    [self playVideo:url];
    
}

sdk4.3沒問題，因爲我需要重新打開保持原來的播放進度！

但在sdk5.0 就出現問題多了1個導航白條， 而且MPMoviePlayerViewController還不是全屏,看不到播放器的控制導航和快進等等、糾結！

用[self presentModalViewController:playerViewController animated:YES]; 白條問題和全屏問題都可以解決，

但是重新打開就是重新播放。 難道魚和熊掌不能兼得？