Issue with mapKit and annotations

Question

I have an app here which uses MapKit, and I draw some overlays and annotations to it.

They do show up, but I have to move the map first or zoom in / out a bit before they are drawn.

Is there any fix to it?

Answer 1

Just call it for map zoom and fit annotations:- [self zoomToFitMapAnnotations:self.mapView];

• (void)zoomToFitMapAnnotations:(MKMapView*)aMapView { if([aMapView.annotations count] == 0) return;

  CLLocationCoordinate2D topLeftCoord; topLeftCoord.latitude = -90; topLeftCoord.longitude = 180;

  CLLocationCoordinate2D bottomRightCoord; bottomRightCoord.latitude = 90; bottomRightCoord.longitude = -180;

  for(PlaceMark *annotation in aMapView.annotations) { topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude); topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);

  bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
  bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
  

  }

  MKCoordinateRegion region; region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5; region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5; region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides

  region = [aMapView regionThatFits:region]; [aMapView setRegion:region animated:YES]; }