ios - 为什么 Alamofire 的上传进度在上传期间从未达到 1.0 的完成？

Question

我能够使用 alamofire 成功上传文件。但是，我正在尝试跟踪上传进度。我发现的是，虽然上传成功，但我可以看到我的文件已成功上传到服务器，但进度跟踪器从未达到 1.0。它往往在 8.00 之间结束 -(低于 1.0)但永远不会达到 1。这会带来问题，因为我需要处理文件上传的完成。

 Alamofire.upload(
        multipartFormData: { multipartFormData in
            for(key, value) in sendParamters{
                multipartFormData.append((value.data(using: .utf8)!), withName: key)
            }

            for fileURL in arrayURLToUpload{
                print("fileURL: \(fileURL)")
                multipartFormData.append(fileURL, withName: "file[]")
            }
    },
        to: UPLOAD_URL,
        encodingCompletion: { encodingResult in
            switch encodingResult {
            case .success(let upload, _, _):
                upload.responseJSON { response in
                    debugPrint(response)
                }

                /**TRACK PROGRESS OF UPLOAD**/
                upload.uploadProgress { progress in
                    print(progress.fractionCompleted) // NEVER REACHES 1.0

                    var progress = progress.fractionCompleted


                }
                /***/


            case .failure(let encodingError):
                print(encodingError)
            }
        }
    )

控制台:

 0.041737145652041
 0.521714320650513
 0.772137194562759

Answer 1

你只需要改变

的位置

upload.uploadProgress { progress in
                print(progress.fractionCompleted) // NEVER REACHES 1.0

与

  upload.responseJSON { response in
            debugPrint(response)
        }  

这是正确的用法:

Alamofire.upload(
        multipartFormData: { multipartFormData in
            for(key, value) in sendParamters{
                multipartFormData.append((value.data(using: .utf8)!), withName: key)
            }

            for fileURL in arrayURLToUpload{
                print("fileURL: \(fileURL)")
                multipartFormData.append(fileURL, withName: "file[]")
            }
    },
        to: UPLOAD_URL,
        encodingCompletion: { encodingResult in
            switch encodingResult {
            case .success(let upload, _, _):

             /**TRACK PROGRESS OF UPLOAD**/
                upload.uploadProgress { progress in
                    print(progress.fractionCompleted)
                }
                /***/

                upload.responseJSON { response in
                    debugPrint(response)
                }

            case .failure(let encodingError):
                print(encodingError)
            }
        }
    )