我想从ios11.0.3中的UIImagePickerControllerPHAsset获取文件名。无法使用此代码获取选取的图像文件名。请帮忙解决这个问题?if#available(iOS11.0,*){letasset=info[UIImagePickerControllerPHAsset]as?PHAssetfileName=((asset?.value(forKey:"filename"))as?String)!}else{//Fallbackonearlierversionsleturl=info[UIImagePickerControllerReferenceURL]as!U