此时此刻,我正在试图弄清楚MKMapView上的坐标是否在提前拉出的纬度/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吗?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
}
答案 0 :(得分:8)
更新SWIFT 4
您正在混淆CGPoints,它们是x和y坐标对,指向视图上的位置,使用CLLocationCoordinate2Ds,它们是地球上的坐标。
对于CGPathContainsPoint,您希望传递polygonRenderer路径(从viewDidLoad()中的多边形创建)和当前位置,如下所示:
let polygonRenderer = MKPolygonRenderer(polygon: polygon)
let mapPoint: MKMapPoint = MKMapPointForCoordinate(coordinate)
let polygonViewPoint: CGPoint = polygonRenderer.pointForMapPoint(mapPoint)
if polygonRenderer.path.contains(polygonViewPoint) {
print("Your location was inside your polygon.")
}
所以你想要考虑你应该把这个代码放在哪里,就像你现在拥有它的地方一样,只要在屏幕上绘制MKOverlay就会调用它,这与此完全无关。
答案 1 :(得分:5)
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.")
}
答案 2 :(得分:0)
Swift 5解决方案:
由于renderer.path的contains方法需要将点指定为CGPoint,因此需要通过MKMapPoint将其从地理坐标转换为重做器的点,否则结果将是意外的。
@objc
func mapTapped(_ tap: UILongPressGestureRecognizer) {
if tap.state == .recognized {
let touchPoint = tap.location(in: mapView)
let coord = mapView.convert(touchPoint, toCoordinateFrom: mapView)
for overlay: MKOverlay in mapView.overlays {
if let polygon = overlay as? MKPolygon {
let renderer = MKPolygonRenderer(polygon: polygon)
let mapPoint = MKMapPoint(coord)
let rendererPoint = renderer.point(for: mapPoint)
if renderer.path.contains(rendererPoint) {
// here comes your code
}
}
}
}
}