如何在Swift 3中显示MKCircle

Question

我在swift 3..updates中显示覆盖图时遇到问题，但我似乎无法显示它:在我的视图中确实加载了

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    mapView.delegate = self
    setup()

    //on tap creates annotation with reverse geocoded address
    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(ViewController.addAnnotation))
    mapView.addGestureRecognizer(tapGesture)


    let coordinates = CLLocationCoordinate2D(latitude: 37.78494283, longitude: -122.39712273)
    let region = CLCircularRegion(center: coordinates, radius: 1000, identifier: "Folsem Office")
    self.mapView.add(MKCircle(center: coordinates, radius: 500))

    region.notifyOnEntry = true
    region.notifyOnExit = true

}

在我的委托方法中：

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    if let circle = overlay as? MKCircle {
        let renderer = MKOverlayRenderer.init(overlay: circle)
        return renderer
    }
    return MKOverlayRenderer()
}

发布的答案https://stackoverflow.com/a/33293217/5988899似乎对我不起作用

Answer 1

用MKCircleRenderer()替换MKOverlayRenderer.init()