Adding MKPolyline Overlay to MKMapView crashes application

Question

My application was working fine on iOS6 but it is crashing on iOS 7 due to bad access when I add overlay to MKMapView.My code is as follows

MKPolyline *polyl         


        

Answer 1

I had the same problem, the stack trace looks misleading to me. My bugfix is to explicitely add the overlay on the main thread:

dispatch_async(dispatch_get_main_queue(), ^{
  [mapView addOverlay:myRouteLine];
});

or if you'd like to use the new MKOverlayRenderer:

dispatch_async(dispatch_get_main_queue(), ^{
  [mapView addOverlay:myRouteLine level:MKOverlayLevelAboveRoads];
});

In my case, I'm downloading asynchronously some data, generate Polylines, create MKOverlayViews / MKOverlayRenderes (didn't help to replace the deprecated code) and add the overlay to the map.