Ios NSURLSession请求和响应

为了了解如何在Objective-C中使用NSURLSession发出GET请求，我想举个例子。那么，如何获得响应呢？

GET

NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"give your url here"]];

//create the Method "GET" 
[urlRequest setHTTPMethod:@"GET"];

NSURLSession *session = [NSURLSession sharedSession];

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
  NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
  if(httpResponse.statusCode == 200)
  {
    NSError *parseError = nil;
    NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
    NSLog(@"The response is - %@",responseDictionary);
  }
  else
  {
    NSLog(@"Error");     
  }
}];
[dataTask resume];

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这个问题有几十个答案，先生，我使用的是objective c。请提供一些教程，解释如何在objective c中使用NSURLSession从服务器获取“获取”请求和响应。在谷歌上，“NSURLSession获取站点：stackoverflow.com objective-c”搜索提供了您是否做过任何研究/尝试？