Check MKMapView contains CLLocationCoordinate2D

mapview_contains_location.m

    MKCoordinateRegion region = mapView.region;
    CLLocationCoordinate2D topLeftCoordinate =
            CLLocationCoordinate2DMake(region.center.latitude + (region.span.latitudeDelta / 2.0),
                    region.center.longitude - (region.span.longitudeDelta / 2.0));

    CLLocationCoordinate2D bottomRightCoordinate =
            CLLocationCoordinate2DMake(region.center.latitude - (region.span.latitudeDelta / 2.0),
                    region.center.longitude + (region.span.longitudeDelta / 2.0));

    MKMapPoint topLeftMapPoint = MKMapPointForCoordinate(topLeftCoordinate);
    MKMapPoint bottomRightMapPoint = MKMapPointForCoordinate(bottomRightCoordinate);
    MKMapRect mapRect = MKMapRectMake(topLeftMapPoint.x, topLeftMapPoint.y,
            fabs(bottomRightMapPoint.x - topLeftMapPoint.x), fabs(bottomRightMapPoint.y - topLeftMapPoint.y));