UIImagePickerController选择视频

Question

我正在使用UIImagePickerController从我的视频库中选择一个视频。 然后我按下选择按钮，设备开始“压缩视频”

它转到

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

然后我用视频做我的东西，当我完成它在后台播放视频的音频。 当然，当我结束时，我使用了dissmiss方法：

[picker dismissModalViewControllerAnimated:YES];

这就是我调用UIImagePickerController的方式：

imagePicker.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
NSArray *mediaTypesAllowed = [NSArray arrayWithObject:@"public.movie"];
[imagePicker setMediaTypes:mediaTypesAllowed];

[self presentModalViewController:imagePicker animated:YES];