iPad：访问相册时发生崩溃

我正在尝试使用以下代码访问相册。它在我的iPhone或iPad上运行良好，低于4.0版本

voidBrowsePhotoLibrary:idsender { }

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在iPad2，4.3版本中，如果相册中至少有一个视频可用，如果相册中没有任何视频，那么相同的代码将在相册中启动。有人能告诉我是什么原因吗？

我通过更改imgPickerController.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum修复了它

我通过更改imgPickerController.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum修复了它；

NSArray *types = [UIImagePickerController availableMediaTypesForSourceType:
    UIImagePickerControllerSourceTypePhotoLibrary];

if ([types containsObject:(id)kUTTypeMovie])
{

    UIImagePickerController *imgPickerController = [[[UIImagePickerController alloc] init] autorelease];
    imgPickerController.delegate = self;
    imgPickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    imgPickerController.mediaTypes = [NSArray arrayWithObject:(id)kUTTypeMovie];

    [self presentModalViewController:imgPickerController animated:YES];             
}