更改UIimagePickerController的默认选项

Question

拍照后，它会显示重新拍摄，预览和使用按钮。我需要将使用按钮更改为保存按钮。是否可以？。

UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        imagePicker.delegate = self;
        [self presentModalViewController:imagePicker animated:YES];