我正在使用CGPathContainsPoint来确定坐标是否在地图上的多边形内,但无论我选择哪个坐标,它总是返回false.

任何人都可以解释究竟出了什么问题？下面是我在Swift中的代码.

class ViewController: UIViewController,MKMapViewDelegate
 
@IBOutlet weak var mapView: MKMapView!
 
    let initialLocation = CLLocation(latitude: 43.656734,longitude: -79.381576)
    let point = CGPointMake(43.656734,-79.381576)
    let regionRadius: CLLocationDistance = 500
    let point1 = CLLocationCoordinate2D(latitude: 43.656734,longitude: -79.381576)
 
    var points = [CLLocationCoordinate2DMake(43.655782,-79.382094),CLLocationCoordinate2DMake(43.657499,-79.382310),CLLocationCoordinate2DMake(43.656656,-79.380497),CLLocationCoordinate2DMake(43.655782,-79.382094)]
 
    override func viewDidLoad() {
        super.viewDidLoad()
 
        centerMapOnLocation(initialLocation)
 
        let polygon = MKPolygon(coordinates: &points,count: points.count)
        mapView.addOverlay(polygon)
 
        var annotation = MKPointAnnotation()
        annotation.coordinate = point1
        annotation.title = "Test"
        annotation.subtitle = "Test"
 
        mapView.addAnnotation(annotation)
        self.mapView.delegate = self
 
    }
 
    func centerMapOnLocation(location: CLLocation) {
        let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,regionRadius * 2.0,regionRadius * 2.0)
 
        mapView.setRegion(coordinateRegion,animated: true)
    }
 
    func mapView(mapView: MKMapView!,rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
        if overlay is MKPolygon {
            let polygonView = MKPolygonRenderer(overlay: overlay)
            polygonView.strokeColor = UIColor.redColor()
 
            if  CGPathContainsPoint(polygonView.path,nil,CGPointMake(43.656734,-79.381576),true) {
                print("True!!!!!")
            } else {
                println("False")
            }
 
            return polygonView
        }
        return nil
    }