iOS开发笔记-102:Swift5 - 通过url下载视频，保存视频

let urlString: String = videoModel?.videoUrl ?? ""
        let session = URLSession.init(configuration: URLSessionConfiguration.default, delegate: self, delegateQueue: OperationQueue.main)
        downloadTask = session.downloadTask(with: urlString.url!)
        downloadTask?.resume()

extension ShowVideoVC: URLSessionDelegate, URLSessionDownloadDelegate {
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        //1.拿到cache文件夹的路径
        let cache = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).last
        //2,拿到cache文件夹和文件名
        let file: String = cache?.appendingPathComponent(downloadTask.response?.suggestedFilename ?? "") ?? ""
        
        do {
            try FileManager.default.moveItem(at: location, to: URL.init(fileURLWithPath: file))
        } catch let error {
            print(error)
        }

        //3，保存视频到相册
        let videoCompatible = UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(file)
        //判断是否可以保存
        if videoCompatible {
            UISaveVideoAtPathToSavedPhotosAlbum(file, self, #selector(didFinishSavingVideo(videoPath:error:contextInfo:)), nil)
        } else {
            JJHUDManage.show("该视频无法保存至相册")
        }
    }
    
    @objc func didFinishSavingVideo(videoPath: String, error: NSError?, contextInfo: UnsafeMutableRawPointer?) {

        if error != nil{
            JJHUDManage.errorShow("保存失败")
            JJLog(error?.localizedDescription)
        }else{
            JJHUDManage.successShow("保存成功")
        }
    }
    
    
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
        
//        //下载进度
//        CGFloat progress = totalBytesWritten / (double)totalBytesExpectedToWrite;
//        dispatch_async(dispatch_get_main_queue(), ^{
//            //进行UI操作  设置进度条
//            self.progressView.progressValue = progress;
//            self.progressView.contentLabel.text = [NSString stringWithFormat:@"%.2f%%",progress*100];
//        });
    }
    
}