videoMaximumDuration不限制持续时间

Question

我希望用户从他的图书馆中挑选视频并将其限制为45秒（如WhatsApp - 您可以编辑视频，并且将发送的视频不会超过45秒。

但如果我使用下面的代码，无论持续时间如何，它都会选择一个视频，我无法修剪它（用视频测试，长度为1分钟）

UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.delegate = self; 
        imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        imagePickerController.videoQuality = UIImagePickerControllerQualityTypeLow;
        imagePickerController.videoMaximumDuration = 45.0f; //?
        imagePickerController.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

        [[self parentViewController] presentModalViewController:imagePickerController animated:YES];
        [imagePickerController release];

在WhatsApp中，我得到以下屏幕，我想重现：

Answer 1

确保在呈现控制器之前将allowsEditing设置为YES。

uiimagePickerController.allowsEditing = YES;