Detecting touches on MKOverlay in iOS7 (MKOverlayRenderer)

Question

I have an MKMapView with possibly hundreds of polygons drawn. Using MKPolygon and MKPolygonRenderer as one is suppose to on iOS7.

What I need is a way of acting upon

Answer 1

FOR SWIFT 2.1 Find a point/coordinate in a Polygon

Here is the logic, without tap gestures, to find an annotation inside a polygon.

 //create a polygon
var areaPoints = [CLLocationCoordinate2DMake(50.911864, 8.062454),CLLocationCoordinate2DMake(50.912351, 8.068247),CLLocationCoordinate2DMake(50.908536, 8.068376),CLLocationCoordinate2DMake(50.910159, 8.061552)]


func addDriveArea() {
    //add the polygon
    let polygon = MKPolygon(coordinates: &areaPoints, count: areaPoints.count)
    MapDrive.addOverlay(polygon) //starts the mapView-Function
}

  func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer! {


    if overlay is MKPolygon {

        let renderer = MKPolygonRenderer(overlay: overlay)
        renderer.strokeColor = UIColor.blueColor()
        renderer.lineWidth = 2 

        let coordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(50.917627), longitude: CLLocationDegrees(8.069562))

        let mappoint = MKMapPointForCoordinate(coordinate)
        let point = polygonView.pointForMapPoint(mappoint)
        let mapPointAsCGP = CGPointMake(point.x, point.y);

        let isInside = CGPathContainsPoint(renderer.path, nil, mapPointAsCGP, false)

        print("IsInside \(isInside)") //true = found

        return renderer
    } else {
        return nil
    }
}

Answer 2

I'm considering to use both overlay and pin Annotation. I get the touch from the pin associated to the overlay.