Swift : MKAnnotation, implementation of mapView delegate to customize pin - ios

Question

I'm just trying to convert the red pins into purple ones.
Here is the FirstViewController.swift code :
import UIKit
import CoreLocation
import MapKit
class FirstViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var theMap: MKMapView!
var locationManager = CLLocationManager()
var userLocation = CLLocation()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
//The Pin
let pin1 = CLLocationCoordinate2D(
latitude: 48.89,
longitude: 2.6968
)
let thepoint = MKPointAnnotation()
thepoint.coordinate = pin1
thepoint.title = "the title"
thepoint.subtitle = "the subtitle"
theMap.addAnnotation(thepoint)
}
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!.pinColor = .Purple
}
else {
pinView!.annotation = annotation
}
return pinView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
println("error")
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
userLocation = locations[0] as! CLLocation
locationManager.stopUpdatingLocation()
let location = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
let span = MKCoordinateSpanMake(0.05, 0.05)
let region = MKCoordinateRegion(center: location, span: span)
theMap.setRegion(region, animated: false)
}
}
I know that I'm doing wrong with the implementation of the mapView function.
Is there anyone to help me ?
Thanks