解雇UIPopoverController使用iPad上的UIImagePickerController视频解散MPMoviePlayerController？

Question

我的应用工作正常iPhone但现在我移植到iPad，要从库中选择视频，我们必须使用UIPopoverController（这是nonatomic的属性属性）同时解除popover中的imagePickerController：

- (UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

委托方法会自动调用我的didFinishMovie并终止它。

-(void)showPopOverGalleryusingDelegate:(id )delegate {

    if ([self.popover isPopoverVisible]) {
        [self.popover dismissPopoverAnimated:YES];
    } else {
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum] )
        {
            UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
            imagePicker.delegate = delegate;
            imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
            imagePicker.allowsEditing = NO;

            self.popover = [[UIPopoverController alloc]
                            initWithContentViewController:imagePicker];


            CGRect popoverRect = [self.view convertRect:[_galleryButton frame]
                                               fromView:[_galleryButton superview]];
         [self.popover presentPopoverFromRect:popoverRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
        }
}

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

// 1 - Get media type
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
// 2 - Dismiss image picker
[self dismissViewControllerAnimated:NO completion:nil];

if (_popover != nil) {
    [_popover dismissPopoverAnimated:YES];
    _popover=nil;
}
// Handle a movie capture
if (CFStringCompare ((__bridge_retained CFStringRef)mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo) {
    // 3 - Play the video

    NSLog(@"imageDelegate");
    _vURL =[info objectForKey:UIImagePickerControllerMediaURL];

    _theMovie = [[MPMoviePlayerViewController alloc]
                                             initWithContentURL:_vURL];



    _theMovie.moviePlayer.controlStyle = MPMovieControlStyleNone;
    _theMovie.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

    [self presentViewController:_theMovie  animated:YES completion:nil];
    [_theMovie.moviePlayer prepareToPlay];


    // 4 - Register for the playback finished notification
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:)
                                                 name:MPMoviePlayerPlaybackDidFinishNotification object:_theMovie.moviePlayer];


   [_theMovie.moviePlayer play];
   [self customPlaybackControls];


}

}

根据我的经验，这是非常不寻常的，我不能自己解决这个问题，我需要对此有新的看法，非常感谢。