title: How do I display MKCircle in Swift 3
body: <p>I am having issues displaying a Overlay in swift 3..updates have been made and i cannot seem to get it to display: in my view did load     </p>
  
  <pre><code>    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
  
  }
  </code></pre>
  
  <p>in my delegate method: </p>
  
  <pre><code>    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -&gt; MKOverlayRenderer {
      if let circle = overlay as? MKCircle {
          let renderer = MKOverlayRenderer.init(overlay: circle)
          return renderer
      }
      return MKOverlayRenderer()
  }
  </code></pre>
  
  <p>answer posted <a href="https://stackoverflow.com/a/33293217/5988899">https://stackoverflow.com/a/33293217/5988899</a> doesnt seem to work for me</p>