Nsurlsession implementing file Uploads

7.1 Related to knowledge points

(1) How to implement file upload

/*      First parameter: Request object     second parameter: request body (file data to upload)     block callback:     NSData: Response body     nsurlresponse: Response header     Nserror: Requested error message      *    /*uploadtask =  [Session uploadtaskwithrequest:request Fromdata:data completionhandler:^ (NSData * __nullable data, Nsurlresponse * __nullable response, Nserror * __nullable Erro R

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

/* call this method to upload the file data if the file data is large, then the method is called multiple parameter descriptions:     totalbytessent: The size     of the file data that has been uploaded */-(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 functions: Nsurlsession can be configured uniformly, such as request timeout, etc.
02 Ways to create and use

//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 NsurlsessionconfigurationNsurlsessionconfiguration *config =[Nsurlsessionconfiguration defaultsessionconfiguration]; //Set request Timeout to 10 secondsConfig.timeoutintervalforrequest =Ten; //whether to continue the request (upload or download) in the case of a cellular networkConfig.allowscellularaccess =NO; _session= [Nsurlsession sessionwithconfiguration:configDelegate: Self delegatequeue:[nsoperationqueue mainqueue]]; }    return_session;}

Nsurlsession implementing file Uploads