title: How to add a circle with a certain radius to my MKpointAnnotation IOS Swift
body: <p>Could someone point me in the right direction for adding a radius to my point. Its pretty standard code, I've tried adding a MKcircle but that hasn't anything to my map.</p>
  
  <p>class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {</p>
  
  <pre><code>@IBOutlet weak var maps: MKMapView!
  var locationManager = CLLocationManager()
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
  
  
  
      var latitude:CLLocationDegrees = 54.53
      var longitude:CLLocationDegrees = -6.055
      var latDelta:CLLocationDegrees = 0.015 //difference of lats from one side of screen to another
      var longDelta:CLLocationDegrees = 0.015 //difference of lats from one side of screen to another
  
      var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
  
      var location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude,longitude)
  
      var region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)
      var lenght:CLLocationDistance = 2
  
  
      var point = MKPointAnnotation()
      self.maps.delegate = self
      point.title = "Home"
      point.subtitle = "time for home"
      point.coordinate = location
  
  
  
      maps.addAnnotation(point)
      maps.selectAnnotation(point, animated: true)
      var cir:MKCircle = MKCircle(centerCoordinate: location, radius: length) //added this but nothing is displayed on map
  
      maps.addOverlay(cir)
  
  
  
      maps.setRegion(MKCoordinateRegionMake(point.coordinate, MKCoordinateSpanMake(latDelta,longDelta)), animated: true)
      // Do any additional setup after loading the view, typically from a nib.
  
  
  }
  
  
  
  func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -&gt; MKAnnotationView! {
  
      if (annotation.isKindOfClass(MKUserLocation)){
          return nil
      }
      var myPin = mapView.dequeueReusableAnnotationViewWithIdentifier("MyIdentifier") as? MKPinAnnotationView
      if myPin != nil {
          return myPin
      }
  
      myPin = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "MyIdentifier")
      myPin?.pinColor = .Green
      return myPin
  }
  </code></pre>