Associating different pin images with different locations iOS - ios

Question

I have an array of 4 locations, and an array of 4 pin names (ie "bluePin.png | redPin.png | etc...")
Currently I'm using a bit of code I found elsewhere to add custom pin graphics to all 4 locations, but all of my pins are red.
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
let annotationReuseId = "Truck"
var trkPin = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationReuseId)
if trkPin == nil {
trkPin = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationReuseId)
} else {
trkPin!.annotation = annotation
}
trkPin!.image = UIImage(named: "redPin.png")
trkPin!.backgroundColor = UIColor.clearColor()
trkPin!.canShowCallout = false
return trkPin
}
How could I associate the pin colors with the locations in the array, so that each location is differentiated by color?
Thanks!

Answer 1

I have done this in the simple way by declaring array of location and array images. And I have viewDidLoad method as follows.
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.delegate = self
let location = [
CLLocationCoordinate2D(latitude: 12, longitude: 77),
CLLocationCoordinate2D(latitude: 12.5, longitude: 77.5),
CLLocationCoordinate2D(latitude: 13, longitude: 78),
CLLocationCoordinate2D(latitude: 13.5, longitude: 78)
]
let pins = [
"red.png",
"blue.png",
"green.png",
"yellow.png"
]
var annotations = [MKPointAnnotation]()
for (index, eachLocation) in location.enumerate() {
let pinImageName = pins[index]
let annotation = MKPointAnnotation()
annotation.coordinate = eachLocation
annotation.title = "\(pinImageName)"
annotations.append(annotation)
}
mapView.addAnnotations(annotations)
}
And in the viewForAnnotation delegate method just getting that image name from the title property and explicitly disabling the callout
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
let annotationReuseId = "Truck"
var trkPin = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationReuseId)
if trkPin == nil {
trkPin = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationReuseId)
trkPin!.canShowCallout = false
} else {
trkPin!.annotation = annotation
if let image = annotation.title {
trkPin!.image = UIImage(named: image ?? "default.png")
} else {
trkPin!.image = UIImage(named: "default.png")
}
}
return trkPin
}