StackOverflow2013

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copied!<p>I believe the issue is that I was not using locking to increment the counters so the while loop would never evaluate to <code>true</code>.</p> <p>I was able to get it working by only looking for a fail count greater than <code>0</code> that way as long as it was incremented by any of the request callback blocks then I know what to do.</p> <p>I just so happen to have switched to <code>[NSOperationQueue waitUntilAllOperationsAreFinished]</code>.</p> <p>Final code:</p> <pre><code>/** Checks if we can communicate with the APIs @result YES if the network is available and all of the registered APIs are responsive */ - (BOOL)apisAvailable { // Check network reachability if (!_connectionAvailable) { return NO; } // Check API server response NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init]; __block NSInteger failedRequests = 0; for (AFHTTPClient *httpClient in _httpClients) { // Send heart beat request NSMutableURLRequest *request = [httpClient requestWithMethod:@"GET" path:@"" parameters:nil]; AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // Server returned good response } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // Server returned bad response failedRequests += 1; }]; [operationQueue addOperation:operation]; } // Wait for heart beat requests to finish [operationQueue waitUntilAllOperationsAreFinished]; // Check final results if (failedRequests > 0) { return NO; } return YES; } </code></pre>

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