Nsurlsession implementing file Uploads

(1) How to implement file upload

      /*     第一个参数：请求对象     第二个参数：请求体（要上传的文件数据）     block回调：     NSData:响应体     NSURLResponse：响应头     NSError：请求的错误信息     */    NSURLSessionUploadTask *uploadTask =  [session uploadTaskWithRequest:request fromData:data completionHandler:^(NSData * __nullable data, NSURLResponse * __nullable response, NSError * __nullable error)

(2) Set up Agent to listen for file upload progress in Agent method

/* 调用该方法上传文件数据 如果文件数据很大，那么该方法会被调用多次 参数说明：     totalBytesSent：已经上传的文件数据的大小     totalBytesExpectedToSend：文件的总大小 */-(void)URLSession:(nonnull NSURLSession *)session task:(nonnull NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend{    NSLog(@"%.2f",1.0 * totalBytesSent/totalBytesExpectedToSend);}

(3) About nsurlsessionconfiguration related

01 作用：可以统一配置NSURLSession,如请求超时等02 创建的方式和使用

Three ways to create a configuration + (Nsurlsessionconfiguration *) defaultsessionconfiguration;+ (nsurlsessionconfiguration *) ephemeralsessionconfiguration;+ (Nsurlsessionconfiguration *) Backgroundsessionconfigurationwithidentifier: (NSString *) Identifier ns_available (10_10, 8_0); //Unified configuration nsurlsession-(nsurlsession *) session{if (_session = = nil) {// Create nsurlsessionconfiguration nsurlsessionconfiguration *config = [nsurlsessionconfiguration Defaultsessionconfiguration]; //set request timeout of 10 seconds Config.timeoutintervalforrequest = 10; //whether to continue the request (upload or download) in the case of a cellular network Config.allowscellularaccess = Span class= "Hljs-literal" >NO; _session = [nsurlsession sessionwithconfiguration:config delegate: self delegatequeue:[nsoperationqueue Mainqueue]]; } return _session;}           

Nsurlsession implementing file uploads