iOS网络请求实现可以有两种方式：
NSURLConnection和NSURLSession的示例代码

NSURLConnection网络请求：

第一种get请求：

    NSString * urlStr = [NSString stringWithFormat:@"http://apps.alicloud.net:6089/flicker_screen/find/detail?appType=%@&sysType=%@&imageResolution=%@",appType, sysType, imageResolution];
    NSURL * url = [NSURL URLWithString:urlStr];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    NSURLResponse *response;
    NSError *error;
    NSData *JsonData;
    [request setURL:url];
    request.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
    [request setHTTPMethod:@"GET"];
    [request setHTTPBody:nil];
    [request setTimeoutInterval:30];
    JsonData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    //解析
    if (JsonData == nil) {
        NSLog(@"send request failed: %@", error);
      }else{
        
        NSDictionary * dicJson = [NSJSONSerialization JSONObjectWithData:JsonData options:NSJSONReadingMutableContainers error:nil];
        NSLog(@"dicJson===:%@",dicJson);
        /*
         dicJson===:{
         content =     {
         "app_type" = wwdc;
         "date_time" = "2018-12-06";
         "deal_name" = "\U5eb7\U51cc\U6ce2";
         id = 151;
         imageUrl = "http://apps.alicloud.net:6089/static/flicker_screen/save_images/KUQ4qnZycBJFRSuWamsoxzfY65OErb3i.png";
         "image_file_base64" = "<null>";
         "image_file_name" = "KUQ4qnZycBJFRSuWamsoxzfY65OErb3i.png";
         "image_number" = "";
         "image_resolution" = 750x1334;
         "source_image_url" = "";
         "sys_type" = IosPhone;
         };
         message = "\U67e5\U8be2\U6210\U529f";
         state = 1;
         }
         */
        NSDictionary * dic = [dicJson valueForKey:@"content"];
        NSLog(@"array:%@",dic);
        
        NSString * imageUrlStr = [dic valueForKey:@"imageUrl"];
        self.imageUrlStr = imageUrlStr;
        NSLog(@"imageUrlStr:%@",imageUrlStr);
    }

第二种 post请求

//  NSString * urlStr = [NSString stringWithFormat:@"http://apps.alicloud.net:6089/flicker_screen/find/detail?appType=%@&sysType=%@&imageResolution=%@",appType, sysType, imageResolution];
    NSString * urlStr = [NSString stringWithFormat:@"http://apps.alicloud.net:6089/flicker_screen/find/detail"];
    NSString * bodyStr = [NSString stringWithFormat:@"appType=%@&sysType=%@&imageResolution=%@",appType, sysType, imageResolution];
    NSURL * url = [NSURL URLWithString:urlStr];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    NSURLResponse *response;
    NSError *error;
    NSData *JsonData;
    [request setURL:url];
    request.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:bodyStr];
    [request setTimeoutInterval:30];
    JsonData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    //解析
    if (JsonData == nil) {
        NSLog(@"send request failed: %@", error);
      }else{
        
        NSDictionary * dicJson = [NSJSONSerialization JSONObjectWithData:JsonData options:NSJSONReadingMutableContainers error:nil];
        NSLog(@"dicJson===:%@",dicJson);
        /*
         dicJson===:{
         content =     {
         "app_type" = wwdc;
         "date_time" = "2018-12-06";
         "deal_name" = "\U5eb7\U51cc\U6ce2";
         id = 151;
         imageUrl = "http://apps.alicloud.net:6089/static/flicker_screen/save_images/KUQ4qnZycBJFRSuWamsoxzfY65OErb3i.png";
         "image_file_base64" = "<null>";
         "image_file_name" = "KUQ4qnZycBJFRSuWamsoxzfY65OErb3i.png";
         "image_number" = "";
         "image_resolution" = 750x1334;
         "source_image_url" = "";
         "sys_type" = IosPhone;
         };
         message = "\U67e5\U8be2\U6210\U529f";
         state = 1;
         }
         */
        NSDictionary * dic = [dicJson valueForKey:@"content"];
        NSLog(@"array:%@",dic);
        
        NSString * imageUrlStr = [dic valueForKey:@"imageUrl"];
        self.imageUrlStr = imageUrlStr;
        NSLog(@"imageUrlStr:%@",imageUrlStr);
    }

类似于这种post请求，之前是允许在链接上传参数的，现在苹果为了更安全，已经禁止这种方式了，只能在HTTPBody中传参数

NSURLSession网络请求：

NSURL *url=[NSURL URLWithString:desturl];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url
                                                                cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                            timeoutInterval:15];
    
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"samli 🐒---data = %@---error = %@",data,error);

        NSString *string_content = [[NSString alloc] initWithCString:gsvr encoding:NSASCIIStringEncoding]; //vpassportal:180/res.php
        WriteLog("the secondRequest string_content:%s == gsvr=%s",[string_content UTF8String],gsvr);
        NSString *desturl =[NSString stringWithFormat:@"https://%@:%d%@",string_content,gPort,@"/ipass00/http/localhost/mobileclientappcontrol"];
        NSURL *url=[NSURL URLWithString:desturl];
        NSMutableURLRequest *secondRequest = [[NSMutableURLRequest alloc] initWithURL:url
                                                                    cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                                timeoutInterval:10];
        NSString *gfaSession = [[NSString alloc] initWithCString:gcDealSessionID encoding:NSASCIIStringEncoding];
        NSString *gfaSession_ =[NSString stringWithFormat:@"%s=%@",SESSION_KEY,gfaSession];
        [request setHTTPMethod:@"GET"];
        [request setValue:@"Keep-Alive" forHTTPHeaderField:@"Connection"];
        [request setValue:gfaSession_ forHTTPHeaderField:@"Cookie"];
        NSURLSessionDataTask *secondTask = [session dataTaskWithRequest:secondRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
        {
            NSLog(@"samli 🐒🐒---data = %@---error = %@",data,error);

            g_iarrPortHeadSize = 0;
            NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
            NSLog(@"the result=%@",result);
            if ([self L4Proxy_DeviceAuth])
            {
                //此判断直接返回 0，不知道为啥
                return;
            }
            
            int len =[result length];
            for (int i= 0; i<len; i++)
            {
                //根据 返回值的长度 来做循环
                //NSRange searchRange = [];
                NSString *nsTemp =[self getBetweenStr:result withBeginStr:@"L," withEndStr:@"\r\n"];
                if (nsTemp ==nil)
                {
                    break;
                }
                
                Source_Split_By_Punctuation([nsTemp UTF8String],",",i);
                
                NSRange r;
                
                int templen = [result length] -[nsTemp length] - 4;
                if (templen < 0)
                    break;
                r.location = [nsTemp length] + 4;
                r.length = templen;
                
                NSString *nsResult = [result substringWithRange:r];
                result = nsResult;
            }
        
            iRet = 0;
            isLoop = YES;
            [gfaSession release];
            [string_content release];
            [secondRequest release];
        }];
        
        [secondTask resume];
        
        [request release];
        
    }];
    
    [task resume];

END