swift 5 下载保存gif到相册

  let imagedata = NSData(contentsOf: URL(string: "https://c-ssl.duitang.com/uploads/blog/202102/24/20210224212717_FETuv.gif")!)
                
            PHPhotoLibrary.shared().performChanges({
            let options =  PHAssetResourceCreationOptions()
                PHAssetCreationRequest.forAsset().addResource(with: .photo, data: imagedata! as Data, options: options)
              }) { (isSuccess: Bool, error: Error?) in
                  if isSuccess {
                      print("保存成功!")
                  } else{
                      print("保存失败：", error!.localizedDescription)
                  }
              }