Can't change marker icon in MapKit - xcode

Question

I did everything on the answer of this link:
Swift different images for Annotation
But the marker icon won't change it just stays the same I tried every way I could find on google but they all give the same result.
This is my code:
import UIKit
import MapKit
class Kaart: UIViewController, MKMapViewDelegate{
#IBOutlet weak var mapView: MKMapView!
let initialLocation = CLLocation(latitude: 52.20614380, longitude: 21.04759094)
let markerLocation = CLLocationCoordinate2D(latitude: 52.20614380, longitude: 21.04759094)
override func viewDidLoad() {
super.viewDidLoad()
UINavigationBar.appearance().translucent = false;
UINavigationBar.appearance().barTintColor = UIColor(red: CGFloat(193.0/255.0), green: 58/255, blue: 44/255, alpha: 1)
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName:UIColor.whiteColor()]
//Set Default location
centerMapOnLocation(initialLocation)
//Place markers
var info1 = CustomPointAnnotation()
info1.coordinate = CLLocationCoordinate2DMake(42, -84)
info1.title = "Info1"
info1.subtitle = "Subtitle"
info1.imageName = "vlag.png"
mapView.addAnnotation(info1)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
let regionRadius: CLLocationDistance = 1000
func centerMapOnLocation(location: CLLocation) {
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
regionRadius * 50.0, regionRadius * 50.0)
mapView.setRegion(coordinateRegion, animated: true)
}
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
if !(annotation is CustomPointAnnotation) {
return nil
}
let reuseId = "test"
var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
if anView == nil {
anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
anView.canShowCallout = true
}
else {
anView.annotation = annotation
}
//Set annotation-specific properties **AFTER**
//the view is dequeued or created...
let cpa = annotation as! CustomPointAnnotation
anView.image = UIImage(named:cpa.imageName)
return anView
}
}
class CustomPointAnnotation: MKPointAnnotation {
var imageName: String!
}