从相机胶卷中选择视频时，info [UIImagePickerController.InfoKey.mediaURL]始终返回nil（Swift）

Question

我有一个imagePickerController，但是无法获取从相机胶卷中选择的视频的url，这曾经有用，但是现在我总是看到从mediaURL返回的nil值。

'''

public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]){

    picker.dismiss(animated: true, completion: nil)
    NewLookMediaImage.layer.borderWidth = 1
    //NewLookMediaImage.layer.borderColor = nil
    NewLookMediaImage.layer.backgroundColor = nil

    let mediaType = info[UIImagePickerController.InfoKey.mediaType] as! CFString
    NewLookMediaButton.setImage(nil, for: .normal)
    //NewLookMediaButton.backgroundColor = UIColor(.black)
    switch mediaType {
      case kUTTypeImage:
        // Handle image selection result
        print("Selected media is image")
        GlobalVideoURL = nil
        let editedImage = info[UIImagePickerController.InfoKey.editedImage] as! UIImage
        NewLookMediaImage.image = editedImage
        PlayButton.isHidden = true

      case kUTTypeMovie:
        // Handle video selection result
        print("Selected media is video")
        let videoUrl = info[UIImagePickerController.InfoKey.mediaURL] as? URL

        let thumnailImage = ThumbnailImageForFileURL(FileURL: videoUrl!)
        GlobalVideoURL = videoUrl
        NewLookMediaImage.image = thumnailImage
        //lets give our video thumbnail a play button
        PlayButton.isHidden = false

      default:
        print("Mismatched type: \(mediaType)")
    }
}

'''

在选择图像但似乎总是失败并返回null的情况下，上面的函数可以正常工作，让let videoUrl = info [UIImagePickerController.InfoKey.mediaURL]如？ URL，导致应用程序崩溃。 任何帮助/解释都将不胜感激