MKPolygon - How to determine if a CLLocationCoordinate2D is in a CLLocationCoordinate2D polygon?

Question

I have the swift code below that draws a polygon and drops an annotation on MKMapView. I am trying to figure out how i could identify if the annotation\'s coordinate is with

Answer 1

You can create a polygon renderer object and check if it's path contains the point based on the location in the map:

func checkIf(_ location: CLLocationCoordinate2D, areInside polygon: MKPolygon) -> Bool {
    let polygonRenderer = MKPolygonRenderer(polygon: polygon)
    let mapPoint = MKMapPointForCoordinate(location)
    let polygonPoint = polygonRenderer.point(for: mapPoint)

    return polygonRenderer.path.contains(polygonPoint)
}