My method NSURLSession blocks

My method NSURLSession blocks

- (void)getRequestData:(NSString *)urlString
               success:(void(^)(NSArray *jsonList))success
               failure:(void(^)(NSError *error))failure
{
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
    
    NSURLSessionDataTask *task = [session dataTaskWithURL:
                                  [NSURL URLWithString:urlString]
                                        completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                            
                                            NSLog(@"error %@", error);
                                            if (error != nil)
                                            {
                                                failure(error);
                                                return;
                                            }
                                            
                                            NSArray *myList = [NSJSONSerialization JSONObjectWithData:data
                                                                                              options:NSJSONReadingAllowFragments
                                                                                                error:nil];
                                            
                                            if([NSJSONSerialization isValidJSONObject:myList])
                                            {
                                                DDLogInfo(@"myList ========================= %@", myList);
                                                
                                                success(myList);
                                                
                                                NSMutableArray *array = [[NSMutableArray alloc] init];
                                                for (NSDictionary *json in myList)
                                                {
                                                    TiqavDataModel *model = [[TiqavDataModel alloc] initWithDictionary:json error:nil];
                                                    [array addObject:model];
                                                }
                                                
                                                self.list = array;
                                                [self.collectionView reloadData];
                                            }
                                            else
                                            {
                                                NSError *error = [NSError errorWithDomain:@"MyDomain"
                                                                                     code:9999
                                                                                 userInfo:@{@"message" : @"json parase error"}];
                                                
                                                  failure(error);
                                            }

                                        }];
    
    [task resume];

}