Custom Annotation Using MKPointAnnotation

This what I'm trying to do:

Use a single custom annotation for all the locations that will populate the map. I have the custom image saved in the assets but, can't make it work.

My code is as follows:

ViewDidLoad()

    if let locationDict = snap.value as? Dictionary<String, AnyObject> {

        let lat = locationDict["LATITUDE"] as! CLLocationDegrees
        let long = locationDict["LONGITUDE"] as! CLLocationDegrees
        let title = locationDict["NAME"] as! String
        let center = CLLocationCoordinate2D(latitude: lat, longitude: long)
        _ = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.10, longitudeDelta: 0.10))

        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2DMake(lat, long)
        annotation.title = title.capitalized // if you need title, add this line
        self.mapView.addAnnotation(annotation)
    }

Use a single custom annotation for all the locations that will populate the map. I have the custom image saved in the assets but, can't make it work (Details in the viewDidLoad)

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

        var annotationView: MKAnnotationView?


        if annotation.isKind(of: MKUserLocation.self) {
            annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "User")
            annotationView?.image = UIImage(named: "icon")
        }



        return annotationView
    }

You should implement delegate method:

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    if annotation.isKind(of: MKUserLocation.self) {
        let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "User")
        annotationView.image = UIImage(named: "icon")
        return annotationView
    }

    let reuseId = "Image"
    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId)
    if annotationView == nil {
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        annotationView?.canShowCallout = true
        annotationView?.image = UIImage(named: "<<image name>>")
    }
    else {
        annotationView?.annotation = annotation
    }

    return annotationView
}