MapViewのタップした箇所に黒丸を描画する
MapViewのタップした箇所に黒丸を描画する方法です。 タップした箇所に黒丸を描画しています。黒丸のサイズは地図に対して相対的ではなく絶対的（地図を拡大すると黒丸も大きくなる）になります。 相対的なものにしたいときはMKPointAnnotationを使うと良いかもしれません。
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| import UIKit | |
| import MapKit | |
| class ViewController: UIViewController { | |
| let mapView = MKMapView() | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| let tapGestureRecognizer = UITapGestureRecognizer() | |
| tapGestureRecognizer.addTarget(self, action: #selector(onTap(sender:))) | |
| mapView.addGestureRecognizer(tapGestureRecognizer) | |
| mapView.frame = view.bounds | |
| mapView.delegate = self | |
| view.addSubview(mapView) | |
| } | |
| @objc func onTap(sender: UITapGestureRecognizer) { | |
| let tapPoint = sender.location(in: mapView) | |
| let location = mapView.convert(tapPoint, toCoordinateFrom: mapView) | |
| let circle = MKCircle(center: location, radius: 10000) | |
| mapView.addOverlay(circle) | |
| } | |
| } | |
| extension ViewController: MKMapViewDelegate { | |
| public func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer { | |
| if let circle = overlay as? MKCircle { | |
| let circleRenderer = MKCircleRenderer(circle: circle) | |
| circleRenderer.strokeColor = .black | |
| circleRenderer.fillColor = .black | |
| circleRenderer.lineWidth = 2.0 | |
| return circleRenderer | |
| } | |
| return MKOverlayRenderer() | |
| } | |
| } |