Cannot change pins for images in a map - ios

Question

I have a map where I mark points based on Parse data. This works correctly. When I try to change the red pins of the map with a custom image, it seems that everything is OK but when I run the app in the simulator, the red pins are there and my image doesn't appear. I have tried some similar versions of the code I have with the same result. I tried to print the annotationView in the console and seems that have the image saved the line before the return. Where is the error? What I have to do to show the custom image correctly? Thanks.
import UIKit
import MapKit
import CoreLocation
import Foundation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
var MapViewLocationManager:CLLocationManager! = CLLocationManager()
var currentLoc: PFGeoPoint! = PFGeoPoint()
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.delegate = self
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]){
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.5, longitudeDelta: 0.5))
self.mapView.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
override func viewDidAppear(animated: Bool) {
let annotationQuery = PFQuery(className: "_User")
currentLoc = PFGeoPoint(location: MapViewLocationManager.location)
annotationQuery.whereKey("restaurant", equalTo: true)
annotationQuery.whereKey("restaurantPosition", nearGeoPoint: currentLoc, withinMiles: 6000)
annotationQuery.findObjectsInBackgroundWithBlock {
(posts, error) -> Void in
if error == nil {
// The find succeeded.
print("Successful query for annotations")
let myPosts = posts as [PFObject]!
for post in myPosts {
let point = post["restaurantPosition"] as! PFGeoPoint
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2DMake(point.latitude, point.longitude)
self.mapViewN(self.mapView, viewForAnnotation: annotation).annotation = annotation
self.mapView.addAnnotation(annotation)
}
} else {
// Log details of the failure
print("Error: \(error)")
}
}
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
print("Error: " + error.localizedDescription)
}
func mapViewN(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView {
let identifier = "pin"
// Reuse the annotation if possible
var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
annotationView!.canShowCallout = true
annotationView!.image = UIImage(named: "map_marker_2")
}
else {
annotationView!.annotation = annotation
}
print(annotationView?.image)
return annotationView!
}
}

Answer 1

Your method map view:viewForAnnotation: is misnamed. You have
func mapViewN(mapView: MKMapView,
viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView
That N in the name does not belong there, so your delegate method will never be called.
(The method name for a delegate method must be exactly correct or the method doesn't get called. For a required delegate method you may even crash.)
It should be:
func mapView(mapView: MKMapView,
viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView

Answer 2

mapViewN:viewForAnnotation delegate is called?
Maybe you should rename mapViewN to mapView.
func mapViewN(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView {
->
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {