CODEWITHSUNDEEP
iphoneiosmapkitmkmapviewmkannotationview
cweinberger
cweinberger

Reputation: 3588

Update AnnotationView after/during zoom

I need to change the centerOffset property of an AnnotationView when the zoomlevel changed. I don't want to remove and add the Annotations again.

So how can I access and update the AnnotationViews after zooming?

Any ideas on this?

Best Regards, Christian

Upvotes: 4

Views: 557

Answers (1)

Vincent Guerci
Vincent Guerci

Reputation: 14419

One solution would be to use these MKMapView methods :

- (NSSet *)annotationsInMapRect:(MKMapRect)mapRect // iOS4.2+ only!

to retrieve visible Annotations, then use :

- (MKAnnotationView *)viewForAnnotation:(id<MKAnnotation>)annotation;

To get the corresponding view (should never return nil if first function does it job correctly)

Then I guess changing centerOffset should do the job, (plus maybe some -[UIView setNeedsDisplay/Layout] to force a redraw)

Changing centerOffset depending on zoomLevel sounds strange, but I guess you have your reasons :)

Upvotes: 4

Related Questions