iOS 原生网络请求写法

// 网络请求
    NSURLSession * mySession = [ NSURLSession sharedSession ];
    NSURL * fullURL = [ NSURL URLWithString :[ NSString stringWithFormat : @"%@/%@" , host , shoplisturl ]];
    NSMutableURLRequest * request = [ NSMutableURLRequest requestWithURL :fullURL cachePolicy : NSURLRequestUseProtocolCachePolicy timeoutInterval : 7.0 ];
    request. HTTPMethod = @"POST" ;
    [request addValue : @"application/x-www-form-urlencoded" forHTTPHeaderField : @"Content-Type" ];
    NSString * paramStr = [ NSString stringWithFormat : @"cate_id=%@&business=%@&p=%@&sort=%@&num=%@&recommend=%@&keyword=%@&lng_lat=%@&uid=%@&token=%@" ,cateID,businessID,page,sort,num,recommend,keyword,lng_lat,userID,token];
    request. HTTPBody = [paramStr dataUsingEncoding : NSUTF8StringEncoding ];
    NSURLSessionDataTask * task = [mySession dataTaskWithRequest :request completionHandler :^( NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        // 判断接口是否成功返回
        if (error) {
            // 接口访问失败
            NSLog ( @"error:%@" ,error. localizedDescription );
            NSLog ( @"%s" ,__func__);
           
            NSInteger status = 0 ;
           
            if (callback) {
                callback(status, @" 网络不给力 " );
            }
        } else
        {
            // 接口访问成功
            //JSON 解析
            NSError * parseError1 = nil ;
            NSDictionary * dic = [ NSJSONSerialization JSONObjectWithData :data options : NSJSONReadingMutableContainers error :&parseError1];
            if (parseError1) {
                NSLog ( @"JSON 解析错误 " );
                return ;
            }
            NSLog ( @"data:%@" , dic);
           
            NSArray *dataArray = [dic objectForKey : @"info" ];
            NSInteger status = [[dic objectForKey : @"status" ] integerValue ];
            if (status == 1 ) {
                if (callback) {
                    dispatch_async ( dispatch_get_main_queue (), ^{
                        callback(status,dataArray);
                    });
                }
            } else {
//                [self showHUDInWindowJustWithText:[dic objectForKey:@"info"] disMissAfterDelay:1.0];
               
                if (callback) {
                    dispatch_async ( dispatch_get_main_queue (), ^{
                        callback(status, nil );
                    });
                }
            }
        }
       
    }];

    [task resume ];