mkmapview - How to create MKCircle in Swift?

Question

Iv been searching all around for a good explanation of how to make an MKCircle annotation for the MapView using Swift 2.0 but I cant seem to find an adequate explanation. Can someone post some example code showing how to create the MKCircle annotation? Here is the code i'm using to make the map and get the coordinate.

let address = self.location

let geocoder = CLGeocoder()

    geocoder.geocodeAddressString(address, completionHandler: {(placemarks, error) -> Void in
        if((error) != nil){
            print("Error", error)
        }
        if let placemark = placemarks?.first {
            let coordinates:CLLocationCoordinate2D = placemark.location!.coordinate

            self.locationCoordinates = coordinates
            let span = MKCoordinateSpanMake(0.005, 0.005)
            let region = MKCoordinateRegion(center: self.locationCoordinates, span: span)
            self.CIMap.setRegion(region, animated: true)

            let annotation = MKPointAnnotation()
            annotation.coordinate = self.locationCoordinates
            self.CIMap.addAnnotation(annotation)

            self.CIMap.layer.cornerRadius = 10.0

            self.CIMap.addOverlay(MKCircle(centerCoordinate: self.locationCoordinates, radius: 1000))
        }
    })

Answer 1

First you need to add MKMapViewDelegate to the class defenition.

 mapView.delegate = self 

Set the maps delegate to self in your viewDidLoad.

Setting the annotation

mapView.addOverlay(MKCircle(centerCoordinate: CLLocationCoordinate2D, radius: CLLocationDistance))

mapView rendererForOverlay should now be called in the mapViews delegate and there you get to draw it

func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
    if let overlay = overlay as? MKCircle {
        let circleRenderer = MKCircleRenderer(circle: overlay)
        circleRenderer.fillColor = UIColor.blueColor()
        return circleRenderer
    }
}

Also, you need to import MapKit for it all to compile