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this should do the trick for you: first, import loginViewController header inside CoreApi.m <pre><code>#import "loginViewController.h" </code></pre> Then, change login method to this: <pre><code>- (void)login:(id)sender { [(loginViewController*)sender loginCallback]; } </code></pre> Or this: <pre><code>- (void)login:(loginViewController*)sender { [sender loginCallback]; } </code></pre> Explanation: notice that your login method is receiving by parameter one object of type <code>id</code> . In objective C, <code>id</code> type means a reference to any Objective-C of unknow class. So, inside your login method, the compiler doesn't know that the sender is a instance of your loginViewController class, so it won't recognize loginViewController's methods. To informations about this, please read: <a href="https://stackoverflow.com/questions/1304176/objective-c-difference-between-id-and-void">Objective-C: difference between id and void *</a> Notice that I only focused in remove your actual error. You should have to do more things in order to accomplish your code to run asynchronous. In order to perform a better callback, please look for delegates or blocks (like in oltman's answer). To run things in background, look for CDG : <a href="http://developer.apple.com/library/ios/#DOCUMENTATION/General/Conceptual/ConcurrencyProgrammingGuide/OperationQueues/OperationQueues.html" rel="nofollow noreferrer">http://developer.apple.com/library/ios/#DOCUMENTATION/General/Conceptual/ConcurrencyProgrammingGuide/OperationQueues/OperationQueues.html</a>
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