无法将Google云端硬盘视频保存到照片库

Question

我正在尝试在我的照片库中保存Google驱动器视频。

我正在使用的代码：

@objc func saveVideosToPhone(videoURL:URL,viewController:UIViewController){
    PHPhotoLibrary.requestAuthorization
    { (status) -> Void in
        switch (status)
        {
        case .authorized:
            // Permission Granted
            print("Write your code here")

            let urlData = NSData.init(contentsOf:videoURL)
            if(urlData != nil)
            {
                let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
                let filePath = String.init(format:"\(documentsPath)/%@.mp4",self.randomString(length:5))
                urlData?.write(toFile: filePath, atomically: true);
                PHPhotoLibrary.shared().performChanges({
                    PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: NSURL(fileURLWithPath: filePath) as URL)
                }) { completed, error in
                    if completed {
                        MBProgressHUD.hide(for:viewController.view, animated:false)
                        UtilityMethods.sharedInstance.showAlert(title:"Save", message:"Video is saved!", viewController:viewController)
                        print("Video is saved!")

                    }else{
                        MBProgressHUD.hide(for:viewController.view, animated:false)
                        UtilityMethods.sharedInstance.showAlert(title:"Error", message:(error?.localizedDescription)!, viewController:viewController)
                        print("error from gd",error?.localizedDescription)
                    }
                }}
        case .denied:
            // Permission Denied
            print("User denied")
        default:
            print("Restricted")
        }
}

但是，第一次当应用程序请求权限并且用户授予权限时，它会显示以下错误：

  

不允许照片访问，授权状态为0

并且，当用户第二次尝试将视频保存到照片库时，它会显示以下错误：

  

无法完成操作