title: won't add custom pin image
body: <p>i'm trying to add a custom pin image however it keep showing that standard red pin instead of the image. what am i doing wrong?</p>
  
  <pre><code>func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -&gt; MKAnnotationView? {
          reuseId = "Pin"
          var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
           pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
          pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
          pinView?.image = UIImage(named: "pikachu.png")
          return pinView
  }
  </code></pre>