阿拉莫火！在多部分文件上传中，progress.isPausable 返回 false，progress.pause() 不起作用

Posted 2023-02-24

【中文标题】阿拉莫火！在多部分文件上传中，progress.isPausable 返回 false，progress.pause() 不起作用

【英文标题】：Alamofire! In multipart file upload progress.isPausable returns false, and progress.pause() does not work

【发布时间】：2017-11-02 07:01:53

【问题描述】：

我想上传具有暂停和恢复功能的文件，只有上传才能正常工作！

代码如下！

configuration = URLSessionConfiguration.background(withIdentifier: 
"com.example.app.background")
 sessionManager = Alamofire.SessionManager(configuration: configuration)

sessionManager.upload( // Or Alamofire.upload(
multipartFormData:  multipartFormData in
multipartFormData.append(self.videoURL, withName: "file", fileName: 
fileName, mimeType: "video/(extention)")
,
to: myServer,
encodingCompletion:  encodingResult in
switch encodingResult 

        case .success(let upload, _, _):
            upload.responseJSON  response in

                if response.error == nil 
                    self.bar_progress.progress = 1
                    self.lbl_uploadProgress.text = "Upload Progress: 100%"
                    print("Upload Status Success: ", response)
                
                else
                    print("Upload Status Fail: ", response)
                
            

            upload.uploadProgress  progress in
                print("Progress: ", progress.fractionCompleted)
                self.bar_progress.progress = Float(progress.fractionCompleted)
                self.lbl_uploadProgress.text = "Upload Progress: \( Int(progress.fractionCompleted * 100))%"

                if progress.isPausable
                    print("Pausable")      // THIS IS WHAT I WANT
                
                else
                    print("Not pausable")    // THIS IS MY PROBLEM
                

            
        case .failure(let encodingError):
            print(encodingError)
            self.bar_progress.progress = 0
            self.lbl_uploadProgress.text = "Upload Progress: 0%"
        

)

谢谢，提前。

【参考方案1】：

您需要计算上传文件的进度。如果进度小于 100%，那么你保持你的视图暂停，一旦它 100%，你可以像这样恢复它。

Alamofire.upload(
.POST,
URLString: "http://httpbin.org/post",
multipartFormData:  multipartFormData in
    multipartFormData.appendBodyPart(fileURL: unicornImageURL, name: "unicorn")
    multipartFormData.appendBodyPart(fileURL: rainbowImageURL, name: "rainbow")
,
encodingCompletion:  encodingResult in
    switch encodingResult 
    case .Success(let upload, _, _):
        upload.progress  bytesRead, totalBytesRead, totalBytesExpectedToRead in

        let progress: Float = Float(totalBytesRead)/Float(totalBytesExpectedToRead) // you can give this progress to progressbar progress

           let value = Int(progress * 100) // this is the percentage of the video uploading

         if value == 100
          // resume the view
         else
          // keep it pause


        
        upload.responseJSON  request, response, result in
            debugPrint(result)
        
    case .Failure(let encodingError):
        print(encodingError)
    

)