Change pin image on MKMapView in Swift

Question

I am trying to change pin image on the MKMapView in Swift, but unfortunately it don't work. Any Idea what I am doing wrong ? I saw some examples here, but did not worked.

import UIKit
import MapKit

class AlarmMapViewController: UIViewController {
    @IBOutlet weak var map: MKMapView!

    override func viewDidLoad() {
        super.viewDidLoad()
        showAlarms()
        map.showsUserLocation = true
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func showAlarms(){

        map.region.center.latitude = 49
        map.region.center.longitude = 12
        map.region.span.latitudeDelta = 1
        map.region.span.longitudeDelta = 1

        for alarm in Alarms.sharedInstance.alarms {

            let location = CLLocationCoordinate2D(
                latitude: Double(alarm.latitude),
                longitude: Double(alarm.longtitude)
            )

            let annotation = MKPointAnnotation()
            annotation.setCoordinate(location)
            annotation.title = alarm.name
            annotation.subtitle = alarm.description
            mapView(map, viewForAnnotation: annotation).annotation = annotation
            map.addAnnotation(annotation)
        }
    }

    @IBAction func zoomIn(sender: AnyObject) {
    }

    @IBAction func changeMapType(sender: AnyObject) {
    }

    func mapView(mapView: MKMapView!,
        viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

        if annotation is MKUserLocation {
            //return nil so map view draws "blue dot" for standard user location
            return nil
        }

        let reuseId = "pin"
        var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
        if pinView == nil {
            pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            pinView!.canShowCallout = true
            pinView!.animatesDrop = true
            pinView!.image = UIImage(named:"GreenDot")!

        }
        else {
            pinView!.annotation = annotation
        }

        return pinView
    }
}

GreenDot picture is available and used on other places.

Answer 1

MKPinAnnotationView always use a pin image, can't be everride. You must use MKAnnotationView instead. Be aware because property animatesDrop it's not a valid MKAnnotationView's property, Rem the line.

Answer 2

Don't forget to set:

map.delegate = self

And make sure your UIViewController implements the MKMapViewDelegate protocol.
If you forget to do this, your implementation of mapView:viewForAnnotation: won't be invoked for your map.

Besides, it looks like pinView!.animatesDrop = true breaks custom images. You'd have to set it to false, or use MKAnnotationView (which doesn't have an animatesDrop property).

See this related question if you want to implement a custom drop animation.