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catching the zoom out event

Can anybody tell me how to catch the zoom out event. My purpose is that i want to disable the auto zoom in when the user zoom o开发者_JAVA技巧ut


The only documented methods related to this are mapView:regionWillChangeAnimated: and mapView:regionDidChangeAnimated: on MKMapViewDelegate, which would be called on zoom out as well as zoom in and scroll.

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