Change CenterOffset of an AnnotationView after zooming [duplicate]

This question already has answers h开发者_JAVA百科ere: Closed 10 years ago.

Possible Duplicate:

MKMapView ignores update of centerOffset in iOS 4

I need to change the centerOffset property of an AnnotationView when the zoomlevel changed.

Any ideas about this?

Best Regards Lima

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this works fine for me in ios5 - to be specific, I have a custom annotation view which changes its frame (expands and collapses). I need to adjust the centerOffset after the frame change otherwise the annotation view would be in the wrong place after the zoom level of the map changes.