Request timeout with Facebook API on iOS - objective-c

Question

I have a bunch of URL requests that are sent out in batch and then a 'catcher' class that recieves the results. I'm doing this through facebook's graph API SDK so I don't have control of the actual NSURL. My problem is that I don't trigger the next result protocol until all requests have come back, but sometimes, especially over 3G, they don't always come back (especially when you have a few hundred). What's a good way to 'give up' on a given request? The way the actual request works, for those who aren't familiar with the FB api, is you initialize a facebook object and then request data from it, and you specify a return delegate. So, for each individual request I have a returnDelegate (the catcher), which I can initialize specific to each request.
UPDATE: Some code from FB-API
- (FBRequest*)requestWithMethodName:(NSString *)methodName
andParams:(NSMutableDictionary *)params
andHttpMethod:(NSString *)httpMethod
andDelegate:(id <FBRequestDelegate>)delegate {
NSString * fullURL = [kRestserverBaseURL stringByAppendingString:methodName];
return [self openUrl:fullURL
params:params
httpMethod:httpMethod
delegate:delegate];
}
- (FBRequest*)openUrl:(NSString *)url
params:(NSMutableDictionary *)params
httpMethod:(NSString *)httpMethod
delegate:(id<FBRequestDelegate>)delegate {
[params setValue:#"json" forKey:#"format"];
[params setValue:kSDK forKey:#"sdk"];
[params setValue:kSDKVersion forKey:#"sdk_version"];
if ([self isSessionValid]) {
[params setValue:self.accessToken forKey:#"access_token"];
}
[self extendAccessTokenIfNeeded];
FBRequest* _request = [FBRequest getRequestWithParams:params
httpMethod:httpMethod
delegate:delegate
requestURL:url];
[_requests addObject:_request];
[_request addObserver:self forKeyPath:requestFinishedKeyPath options:0 context:finishedContext];
[_request connect];
return _request;
}
- (void)connect {
if ([_delegate respondsToSelector:#selector(requestLoading:)]) {
[_delegate requestLoading:self];
}
NSString* url = [[self class] serializeURL:_url params:_params httpMethod:_httpMethod];
NSMutableURLRequest* request =
[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:kTimeoutInterval];
[request setValue:kUserAgent forHTTPHeaderField:#"User-Agent"];
[request setHTTPMethod:self.httpMethod];
if ([self.httpMethod isEqualToString: #"POST"]) {
NSString* contentType = [NSString
stringWithFormat:#"multipart/form-data; boundary=%#", kStringBoundary];
[request setValue:contentType forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[self generatePostBody]];
}
_connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
self.state = kFBRequestStateLoading;
self.sessionDidExpire = NO;
}

Answer 1

As discussed above, you can implement your own timeout by instantiating an NSTimer which will signal a delegate object when a certain amount of time elapses.