ios - 在 Swift 中渲染 MKPolyline
问题描述
我试图在 MapKit 上简单地创建一条直线。我(似乎)成功地创建了折线,因为构建成功且没有错误。但是,该行仍未渲染。
import UIKit
import MapKit
class ViewController: UIViewController, MKMapViewDelegate{
@IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
let point1 = CLLocationCoordinate2DMake(37.558359, -77.483795);
let point2 = CLLocationCoordinate2DMake(37.558062, -77.482958);
let points: [CLLocationCoordinate2D]
points = [point1, point2]
let polyline = MKPolyline(coordinates: &points, count: points.count)
self.mapView.addOverlay(polyline)
}
}
extension ViewController {
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) ->
MKOverlayRenderer {
if overlay is MKPolyline {
let renderer = MKPolylineRenderer(overlay: overlay)
renderer.strokeColor = UIColor.orange
renderer.lineWidth = 3
return renderer
}
return MKOverlayRenderer()
}
}
解决方案
您可能需要在viewDidLoad
self.mapView.delegate = self