Force MKMapView viewForAnnotation to update

Question

So I have a MKMapView with all my pins added, and the colour of the pin is dependent on whether a value is set for that pin. When I first load the app, viewForAnnotation

Answer 1

I also found this answer helpful: In which case that mapView:viewForAnnotation: will be called?

Whenever you call addAnnotation method

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation gets called.