ios - Add different pin color with MapKit in swift 2.1

Question

I'm new in Swift. I'm trying to have different color pin or custom pin on specific pin. My code works. I've a purple pin, but I want make a difference between them. How can I do it? I think there something to do in MapView delegate method but I didn't find it.

import UIKit
import MapKit

class MapsViewController: UIViewController , MKMapViewDelegate{
    var shops: NSArray? {
        didSet{
            self.loadMaps()
        }
    }

    @IBOutlet weak var map: MKMapView?

    override func viewDidLoad() {
        super.viewDidLoad()
        loadMaps()
        self.title = "Carte"
        self.map!.delegate = self

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
        // simple and inefficient example

        let annotationView = MKPinAnnotationView()

        annotationView.pinTintColor = UIColor.purpleColor()
        return annotationView
    }

    func loadMaps(){
//        navigationController?.navigationBar.topItem!.title = "Carte"
        let shopsArray = self.shops! as NSArray
        for shop in shopsArray  {

            let location = CLLocationCoordinate2D(
                latitude: shop["lat"] as! Double,
                longitude: shop["long"] as! Double
            )


            let annotation = MKPointAnnotation()
            annotation.coordinate   = location
            annotation.title        = shop["name"] as? String
            annotation.subtitle     = shop["addresse"] as? String

            map?.addAnnotation(annotation)

        }





        // add point



    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

Answer 1

A better approach is to use a custom annotation class that implements the MKAnnotation protocol (an easy way to do that is to subclass MKPointAnnotation) and add whatever properties are needed to help implement the custom logic.

In the custom class, add a property, say pinColor, which you can use to customize the color of the annotation.

This example subclasses MKPointAnnotation:

import UIKit
import MapKit

class ColorPointAnnotation: MKPointAnnotation {
    var pinColor: UIColor

    init(pinColor: UIColor) {
        self.pinColor = pinColor
        super.init()
    }
}

Create annotations of type ColorPointAnnotation and set their pinColor:

let annotation = ColorPointAnnotation(pinColor: UIColor.blueColor())
annotation.coordinate = coordinate
annotation.title = "title"
annotation.subtitle = "subtitle"
self.mapView.addAnnotation(annotation)

In viewForAnnotation, use the pinColor property to set the view's pinTintColor:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    if annotation is MKUserLocation {
        return nil
    }

    let reuseId = "pin"
    var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
    if pinView == nil {
        pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)

        let colorPointAnnotation = annotation as! ColorPointAnnotation
        pinView?.pinTintColor = colorPointAnnotation.pinColor
    }
    else {
        pinView?.annotation = annotation
    }

    return pinView
}