At the center of the screen I have image with sight, If user moving map with GMSMarker’s on it I need to highlight GMSMarker when it hits the sight.
so I am using delegate of GMSMapViewDelegate
func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition)
it is not clear how to compare coordinates of GMSMarker and center of the screen, I guess it should be some rectangle area around GMSMarker which sight should cross?