01 使用URLSession进程POST请求

构造URL网络地址

NSURL *url = [NSURL URLWithString:@"http://piao.163.com/m/cinema/list.html?app_id=1&mobileType=iPhone&ver=2.6&channel=appstore&deviceId=9E89CB6D-A62F-438C-8010-19278D46A8A6&apiVer=6&city=110000"];

构造网络请求对象 NSURLRequest

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    //设置请求方式 POST
    request.HTTPMethod = @"POST";
    //设置请求的超时时间
    request.timeoutInterval = 60;
    //设置请求体
    NSString *bodyString = @"cinema_id=1533";
    //将字符串 转化为NSData
    request.HTTPBody = [bodyString dataUsingEncoding:NSUTF8StringEncoding];

通过配置对象构造网络会话 NSURLSession

NSURLSession *session = [NSURLSession sharedSession];

创建网络任务 NSURLSessionTask

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        //JSON解析
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
        NSLog(@"%@", dic);
    }];

发起网络任务

[dataTask resume];