How to “unfreeze” your iPhone Application

To avoid “freezing” your application, ensure that any logic that is changing your UI is performed by the Main thread. One approach to this would be to leverage the NSNotificationCenter but sometimes that is overkill. A much simpler approach is to use one of the following performSelectorOnMainThread methods on NSObject:

performSelectorOnMainThread:withObject:waitUntilDone:  performSelectorOnMainThread:withObject:waitUntilDone:modes: