Stuck on using MKPinAnnotationView() within Swift and MapKit

Question

I have a working loop to setup annotations for the title and subtitle elements for some working data points. What I want to do within that same loop structure is to set the

Answer 1

You need to implement the viewForAnnotation delegate method and return an MKAnnotationView (or subclass) from there.
This is just like in Objective-C -- the underlying SDK works the same way.

Remove the creation of MKPinAnnotationView from the for loop that adds the annotations and implement the delegate method instead.

Here is a sample implementation of the viewForAnnotation delegate method in Swift:

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
}