NSURLSessionDataTask使用

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参考链接：

http://www.cnphp6.com/archives/64928【介绍】

http://blog.csdn.net/majiakun1/article/details/38133703【demo】

使用GCD

//异步发送数据
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //得到url
        NSURL * requestUrl = [NSURL URLWithString:@"https://www.baidu.com"];
        //得到nsMutableUrlRequest
        NSMutableURLRequest * request = [[NSMutableURLRequest alloc] initWithURL:requestUrl];

        [request setTimeoutInterval:30];
        [request setHTTPMethod:@"POST"];


        if (contentData != nil) {

            [request setHTTPBody:contentData];

        }

        //构造session
        NSURLSession * session = [NSURLSession sharedSession];
        //task
        NSURLSessionDataTask * callBackData = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

            [self showResponseCode:response];
            if (error != nil) {
                NSLog(@"%s >> error>> %@", __PRETTY_FUNCTION__, error);
            }

            NSMutableDictionary * reciveDic = nil;
            if ([data length] > 0) {
                //有返回数据
                reciveDic =[self getDictionaryWithData:data];

                // 打印返回的数据
                NSLog(@"\n\n<==接口返回: %@\n<==返回数据:%@\n", requestUrl, reciveDic);


            }else
            {
            }
        /*    dispatch_async(dispatch_get_main_queue(), ^{
                completionBlock(reciveDic,nil);
            });//回调结果

*/        }];
        [callBackData resume];
    });

- (void)showResponseCode:(NSURLResponse *)response{
    NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse *)response;
    NSInteger responserStatusCode = [httpResponse statusCode];
    NSLog(@"请求后的状态--》%ld",(long)responserStatusCode);
}

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