Question

Wrapping up my first project using ARC. Imagine my surprise then, to discover a leak almost immediately. Does anyone have any insight as to why the following code would leak with symbol identifier: ‘dispatch_queue_create’:

This is using an overly simplified TWRequest handler in iOS5 w/ ARC:

- (void)loadSomeTweets
{


NSString *queryString = [NSString stringWithString:@"http://search.twitter.com/search.json?"];
NSDictionary *parameters = [NSDictionary dictionaryWithObjectsAndKeys:@"%23WatchingTheVoice", @"q", nil];

NSURL *targetedSearchURL = [NSURL URLWithString:queryString];
TWRequest *targetedRequest = [[TWRequest alloc] initWithURL:targetedSearchURL
                                                 parameters:parameters
                                              requestMethod:TWRequestMethodGET];


[targetedRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) 
 {
    //Do something

 }];

}

Why does this leak? The call stack implicates the performRequestWithHandler, but the leak occurs regardless of what I do within the callback handler, even an empty implementation (as shown here) produces the leak. The leak occurs on the simulator and devices.

Answer 1

This problem is the result of a memory leak in Apple’s Twitter framework.