MapKit Polygon contains point

gistfile1.txt

// taken from http://stackoverflow.com/a/41923217

extension MKPolygon {
    func contain(coor: CLLocationCoordinate2D) -> Bool {
        let polygonRenderer = MKPolygonRenderer(polygon: self)
        let currentMapPoint: MKMapPoint = MKMapPointForCoordinate(coor)
        let polygonViewPoint: CGPoint = polygonRenderer.point(for: currentMapPoint)
        return polygonRenderer.path.contains(polygonViewPoint)
    }
}