Responding to User Interactions
An MKMapViewDelegate can be specified to react to user interactions with the map. Typical user interactions with a map include responding to panning and zooming, handling draggable annotations, and responding when the user taps a callout.
When the map is being panned and zoomed, the mapView:regionWillChangeAnimated: and mapView:regionDidChangeAnimated: delegate methods are called. In the sample app no additional action is required for the map to resize and adjust the annotations; however, in an app with a large number of potential items to display on the map or an app that shows different information at different zoom levels, these delegate methods are useful for removing map annotations that are no longer visible ...
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