MapKit 叠加 - 圆形

Question

我正在尝试向地图添加一个圆形叠加层，但从未成功 - 添加了注释，仅此而已 这是代码示例

 func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer 
 let circle = MKCircleRenderer(overlay: overlay)
 circle.fillColor = UIColor.black.withAlphaComponent(0.1)
 circle.strokeColor = UIColor.red
 circle.lineWidth = 9
 return circle
}

let circle = MKCircle(center: coordinates, radius: 9000)
 mapView.addAnnotation(Loka_Location)
 mapView.addOverlay(circle)

Answer 1

您可能错过了设置 mapView 的委托。

mapView.delegate = self

别忘了

class ViewController: UIViewController, MKMapViewDelegate {}