Why am I crashing after MKMapView is freed if I'm no longer using it?

Question

I have a MKMapView. Sometimes after my view controller is dismissed, I\'ll get a EXC_BAD_ACCESS.

I turned on NSSZombies and it

Answer 1

OK, this is the confirmation of the answer. It's from the Apple doc, but it's missing from MKMapView. It's only found under the documentation for its delegate protocol:

Before releasing an MKMapView object for which you have set a delegate, remember to set that object’s delegate property to nil. One place you can do this is in the dealloc method where you dispose of the map view.

NOTE: This also applies to UIWebView.

I set the MapView's delegate pointer to nil in the delegate's dealloc method, and our crashes seem to have been eliminated.