block variables

sample.m

__weak typeof(self) weakSelf = self;
AFJSONRequestOperation *operation =
        [AFJSONRequestOperation JSONRequestOperationWithRequest:request
                                                        success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
                                                            NSDictionary *jsonDict = (NSDictionary *) JSON;
                                                            // this is the array that stores the JSON response
                                                            NSArray *csvFiles = [jsonDict objectForKey:@"csv_files"];
                                                            [weakSelf doSomethingWithTheArray:csvFiles];
                                                                                            
                                                    }   failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
                                                            NSLog(@"Request Failure Because %@",[error userInfo]);
                                                                                            }];
    
    [operation start];