Question

How do I convert distance (for example 400 meters) on MKMapView to distance for UIView?
I want to show MKAnnotationView that depends on current zoom level on MKMapView.

Answer 1

First, create a region with 400 meters length:

MKCoordinateRegion myRegion = MKCoordinateRegionMakeWithDistance(mapView.centerCoordinate, 400, 0);

After that use convert region methods for getting real rect:

CGRect myRect = [mapView convertRegion: myRegion toRectToView: nil];
NSLog(@"width for 400m is %f", myRect.size.width);

Hope, this helps.