Objective-C AFnetworking：停止请求(Objective-C AFnetworking: stopping a request)

 晚上，我正在使用Marvel-API，尝试下载所有角色。 
 
 要下载您必须执行多个请求的所有字符，您可以在每个请求中指定限制和偏移量。 
 
 所以我将限制设置为最大值100，并且对于每个请求，我将偏移量增加100。 
 
 这样做，我做了无限的要求。 当然。 
 
 所以我认为当从JSON对象检索到的“results”数组为空时我应该停止。 
 
 所以逻辑应该是好的，我一直要求字符100乘100，直到没有更多要检索。 
 
 但当然使用网络和异步代码并不总是那么容易。 显然我有了库存。 
 
 我确信问题出在这些代码行中： 
 
#pragma mark - Requesting data
-(void)getData {
   NetworkManager *networkManager = [NetworkManager alloc];


    while(self.requestMustEnd == false) {
        NSLog(@"offset: %d", networkManager.offset);

        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        [manager GET:networkManager.getUrlPath parameters:nil progress:nil success:^(NSURLSessionTask *task, id responseObject) {
            NSLog(@"JSON: %@", responseObject);
            [self parseResponseData:responseObject];
        } failure:^(NSURLSessionTask *operation, NSError *error) {
            NSLog(@"Error: %@", error);
        }];

        [networkManager increaseOffset];
    }

}


#pragma mark - Parsing Method

-(void)parseResponseData:(NSDictionary *)responseDictionary {
    NSArray *marvelArray = [[responseDictionary objectForKey:@"data"] objectForKey:@"results"];
    if (marvelArray.count == 0) {
        self.requestMustEnd = true;
    }
    for(NSDictionary* marvel in marvelArray)
    {
        Character *currentMarvelEntity = [[Character alloc] initWithMarvel:marvel];
        //NSLog(@"currentMarvelEntity %@", currentMarvelEntity.name);
        [self.marvelCharacters addObject:currentMarvelEntity];
    }
    [self.tableView reloadData];
}
 
 停止请求的关键部分是： 
 
if (marvelArray.count == 0) {
        self.requestMustEnd = true;
    }
 
 但是，它仍然永远不会要求。 我确定，这不是if条件。 但可能是因为拥有异步代码，getData func无论是什么继续请求数据。 
 
 有小费吗？ 

Evening, I'm working with the Marvel-API, trying to download all the characters.
 
To download all the characters you have to do multiple requests, in each request you can specified the limit and the offset.
 
So I've set the limit at the max of 100 and for every request I increase the offset by 100.
 
Doing that, I do infinite request. Of course.
 
So I thought that I should stop when the "results" array retrieved from the JSON object is empty.
 
So the logic should be good, I keep requesting characters 100 by 100 until there are no more to retrieve.
 
But of course working with networking and async code isn't always so easy. And obviously I got stocked.
 
I'm sure that the problems is in these lines of code:
 
#pragma mark - Requesting data
-(void)getData {
   NetworkManager *networkManager = [NetworkManager alloc];


    while(self.requestMustEnd == false) {
        NSLog(@"offset: %d", networkManager.offset);

        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        [manager GET:networkManager.getUrlPath parameters:nil progress:nil success:^(NSURLSessionTask *task, id responseObject) {
            NSLog(@"JSON: %@", responseObject);
            [self parseResponseData:responseObject];
        } failure:^(NSURLSessionTask *operation, NSError *error) {
            NSLog(@"Error: %@", error);
        }];

        [networkManager increaseOffset];
    }

}


#pragma mark - Parsing Method

-(void)parseResponseData:(NSDictionary *)responseDictionary {
    NSArray *marvelArray = [[responseDictionary objectForKey:@"data"] objectForKey:@"results"];
    if (marvelArray.count == 0) {
        self.requestMustEnd = true;
    }
    for(NSDictionary* marvel in marvelArray)
    {
        Character *currentMarvelEntity = [[Character alloc] initWithMarvel:marvel];
        //NSLog(@"currentMarvelEntity %@", currentMarvelEntity.name);
        [self.marvelCharacters addObject:currentMarvelEntity];
    }
    [self.tableView reloadData];
}
 
The key part to stop the request is:
 
if (marvelArray.count == 0) {
        self.requestMustEnd = true;
    }
 
But, still, it never end to request. it is not for the if condition, I'm sure. But probably because, having an async code, the getData func no matter what keep requesting data.
 
Any tips?

原文：