Swift 4-使用URLSession获取上传图像进度

Question

我在下面有这样的代码

func upload(){
    let img = UIImage(named: "1")
    let imgData = UIImageJPEGRepresentation(img!, 1)
    let data = imgData?.base64EncodedString()

    var request = URLRequest(url: URL(string: url)!)
    request.httpMethod = "POST"
    request.setValue("\(auth)", forHTTPHeaderField: "Authorization")
    request.setValue("application/xml", forHTTPHeaderField: "Content-Type")

    var postString = "<uploadrequest>"
    postString += "<folderid>123</folderid>"
    postString += "<folder_name>images</folder_name>"
    postString += "<image_byte>\(data!)</image_byte>"
    postString += "</uploadrequest>"

    request.httpBody = postString.data(using: .utf8)

    let configuration = URLSessionConfiguration.default
    let session = URLSession(configuration: configuration, delegate: self, delegateQueue: OperationQueue.main)

    let task = session.uploadTask(with: request, from: imgData!, completionHandler: {
        (data, response, error) -> Void in

        if let error = error {
            print(error)
            return
        }
        if let data = data {
            _ = self.parseJsonData(data: data)
        }
    })

    task.resume()
}

func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
    print("sent:", totalBytesSent, "from:", totalBytesExpectedToSend)

    let size = totalBytesSent / totalBytesExpectedToSend
    self.progressbar.progress = Float(size)
}

我的目标是使用API上传图像，并获得其上传进度。将图像转换为base 64并插入到

然后我得到的是这样的东西：

发送： 32768从： 927220发送： 65536从： 927220发送： 131072从： 927220发送： 163840从： 927220发送： 262144从： 927220发送： 294912从： 927220发送： 360448从： 927220发送： 393216从： 927220发送： 425984从： 927220发送： 491520从： 927220发送： 524288从： 927220发送： 557056从： 927220发送： 589824从： 927220发送： 622592从： 927220发送： 655360从： 927220发送： 688128从： 927220发送： 720896从： 927220发送： 786432从： 927220发送： 819200从： 927220发送： 851968从： 927220发送： 927220来自： 927220错误域=NSCocoaErrorDomain Code=3840"JSON文本没有以数组或对象开始，并且选项允许不设置片段。"JSON文本没有以数组或对象开始，并且选项允许不设置片段。}

但是如果我使用其他类似的方法（没有uploadTask），它工作得很好，但是没有上传进度。

let task = URLSession.shared.dataTask(with: request, completionHandler: {
        (data, response, error) -> Void in

        if let error = error {
            print(error)
            return
        }
        if let data = data {
            _ = self.parseJsonData(data: data)
        }
    })

我也尝试了Alamofire。Alamofire与请求函数是成功的，但仍然没有给出上传进度和Alamofire与上传函数（MultipartformData）使此错误：

responseSerializationFailed（原因：Alamofire.AFError.ResponseSerializationFaileureReason.jsonSerializationFailed（错误：错误域=NSCOCAERRORDOMAIN代码=3840“字符3周围的无效值”。用户信息={NSDebugDescription=字符3周围的无效值。}））

我想知道我的代码是否出错。你能告诉我该怎么处理我的代码吗？或者问题出在我的应用编程接口上，因为我的应用编程接口只接受一个bas64代码？

如果你想看我的Alamofirecode，它就在那里

拜托，谁来帮我解决这个问题。

谢谢！：）

编辑1

这是我通过请求功能得到的结果（没有上传功能）

{
    "media_preview" =     {
        "image_media" =         {
            fileid = 4928501;
            filename = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            folderpath = "product\\66861/images800\\";
            height = 533;
            src = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            width = 800;
        };
        "medium_media" =         {
            fileid = 4928503;
            filename = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            folderpath = "product\\66861/images500\\";
            height = 333;
            src = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            width = 500;
        };
        "small_media" =         {
            fileid = 4928503;
            filename = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            folderpath = "\product\\66861/images300\\";
            height = 200;
            src = "/zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            width = 300;
        };
        "source_media" =         {
            fileid = 4928499;
            filename = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            folderpath = "\\product\\66861images\\";
            height = 666;
            src = "/zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            width = 999;
        };
        "thumbnail_media" =         {
            fileid = 4928507;
            filename = "zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            folderpath = \\product\\66861/thumb\\";
            height = 150;
            src = "/zhzvoHBb1ogda9bps13R5IavYiadCm.jpg";
            width = 150;
        };
    };
    responsestatus =     {
        "access_token" = "<null>";
        code = 00;
        description = Success;
    };
}

编辑2这是parseJsonData（数据：data）

func parseJsonData(data: Data) {
    do {
        let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
        print(jsonResult!)
    } catch {
        print(error)
    }
}




Answer 1

要获取进度，请使用URLSession的以下委托方法，您可以在didReceiveData方法中获取进度

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {

        //here you can get full lenth of your content
        expectedContentLength = Int(response.expectedContentLength)
        println(expectedContentLength)
        completionHandler(NSURLSessionResponseDisposition.Allow)
    }

    func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {


        buffer.appendData(data)

        let percentageDownloaded = Float(buffer.length) / Float(expectedContentLength)
        progress.progress =  percentageDownloaded
    }

    func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {
        //use buffer here.Download is done
        progress.progress = 1.0   // download 100% complete
    }

Answer 2

对于具有多个参数上传到服务器的图像。试试这个代码Alamofire。它去工作。

Alamofire.upload(multipartFormData: { (multipartFormData : MultipartFormData) in
            let count = imageToUpload.count
            for (key, value) in parameters {
                multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
            }
            for i in 0..<count{
                let image:UIImage = self.loadImage(imageToUpload[i])
                if let imageData = image.jpegData(compressionQuality: 0.5) {
                    let imageName  = "image[\(i)]"
                    multipartFormData.append(imageData as Data, withName:imageName , fileName: imageToUpload[i], mimeType: "image/jpeg")
                }
            }
        }, usingThreshold: UInt64.init(), to: serviceUrl, method: .post, headers: headers)  { (result) in
            switch result {
            case .success(let upload, _ , _):
                upload.uploadProgress(closure: { (progress) in
                    print("uploding: \(progress.fractionCompleted)")
                })
                upload.responseJSON { response in
                    if response.result.isFailure {
                        if let err = response.error{
                            print(err)
                        }
                        return
                    }

                    guard let jsonData = response.result.value else {                           
                        return
                    }
                    //

                    do{
                        let json = try JSONSerialization.jsonObject(with: response.data as! Data, options: [])
                        print("josnResposne:\(json)")

                    } catch let parsingError {
                        print("Error", parsingError)
                    }

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