如何使用 MapKit 和 swift 绘制多边形叠加层

Question

我正在尝试使用以下代码在地图上绘制多边形，但由于某种原因它不起作用。我这里哪里出错了？

import UIKit
import MapKit

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let initialLocation = CLLocation(latitude: 49.140838, longitude: -123.127886)
        centerMapOnLocation(initialLocation)
        addBoundry()
    }


    func addBoundry()
    {
        var points=[CLLocationCoordinate2DMake(49.142677,  -123.135139),CLLocationCoordinate2DMake(49.142730, -123.125794),CLLocationCoordinate2DMake(49.140874, -123.125805),CLLocationCoordinate2DMake(49.140885, -123.135214)]

        let polygon = MKPolygon(coordinates: &points, count: points.count)

        mapView.addOverlay(polygon)
    }


    let regionRadius: CLLocationDistance = 1000
    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.magentaColor()

        return polygonView
    }

    return nil
}

Answer 1

您似乎已将 mapView(_:renderFor:)（以前称为 rendererForOverlay）实现为全局函数。该方法必须在 ViewController class 定义中，或者更好的是，为了使我们的代码井井有条，在 MKMapViewDelegate 扩展名中：

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        ...
    }
}

此外，请确保您已将视图控制器定义为地图视图的 delegate。在 IB 中可能最容易做到这一点，但您也可以在 viewDidLoad:

中做到这一点

mapView.delegate = self

如何使用 MapKit 和 swift 绘制多边形叠加层

How to draw a polygon overlay using MapKit and swift

mapkit

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ios

swift