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

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This is because of the way MKMapView works. There’s an operation pending, so MapKit is retaining the MKMapView and it hasn’t actually been deallocated yet. That isn’t itself a problem. The problem is that it’s still sending messages to your delegate.

The workaround is simple: As part of your view controller’s cleanup set the map view’s delegate to nil, which will prevent MKMapView from sending messages to it.

This is documented in MKMapViewDelegate Protocol Reference:

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.

Edit: Give Oscar an upvote as well, just below, who provided the documentation quote here.

Given ARC, I suggest this means you should set your map view’s delegate to nil in your view controller’s dealloc.

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