此时,我正在试图弄清楚MKMapView上的坐标是否在提前绘制出来的纬度/经度的MKPolygon内.
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
}
解决方法
针对Swift 3进行了更新
let polygonRenderer = MKPolygonRenderer(polygon: polygon)
let mapPoint: MKMapPoint = MKMapPointForCoordinate(coordinate)
let polygonViewPoint: CGPoint = polygonRenderer.point(for: mapPoint)
if polygonRenderer.path.contains(polygonViewPoint)
{
print("Your location was inside your polygon.")
}
