I have a subclass of MKPointAnnotation called CustomPointAnnotation:
class CustomPointAnnotation: MKPointAnnotation {
var imageName: String!
var theItemObject: PFObject?
var theImage: UIImage?
}
In the view controller dealing with the map (and yes I have the class set to the MKMapViewDelegate), I run a function called getAnnotations() which successfully adds my various annotations to the map (which happen to be objects retrieved from Parse). Each annotation object has an image associated with it, that's the theImage in the class above.
My confusion is how viewForAnnotation gets called before didSelectAnnotationView. Because of this, I am unable to extract the image stored in the class, which I want to use for the detailCalloutAccessoryView of the callout.
Below is my viewForAnnotation function:
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
if !(annotation is CustomPointAnnotation) {
return nil
}
print("viewForAnnotation was called!")
let reuseId = "test"
var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
if anView == nil {
anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
anView!.canShowCallout = true
}
else {
anView!.annotation = annotation
}
//Set annotation-specific properties **AFTER**
//the view is dequeued or created...
let cpa = annotation as! CustomPointAnnotation
anView!.image = UIImage(named:cpa.imageName)
let rightButton: UIButton = UIButton(type: .DetailDisclosure)
rightButton.setImage(UIImage(named: "arrow-icon.png"), forState: .Normal)
rightButton.tintColor = UIColor.grayColor()
rightButton.addTarget(self, action: Selector("showItemDetail:"), forControlEvents: UIControlEvents.TouchUpInside)
anView!.rightCalloutAccessoryView = rightButton
print("about to print the array of selected annotations")
print(mapView.selectedAnnotations)
if mapView.selectedAnnotations.count > 0 {
print("THIS IS NEVER SATISFIED, I WILL NEVER GET HERE, WHY?!")
//yes, there is an annotation currently selected
if let selectedAnnotation = mapView.selectedAnnotations[0] as? CustomPointAnnotation {
fullImageOfItem = selectedAnnotation.theImage
print("i just set the image")
}
}
else {
print("there are no selected annotations")
}
let myCustomImage: UIImageView = UIImageView(image: fullImageOfItem)
anView!.detailCalloutAccessoryView = myCustomImage
return anView
}
I don't understand why mapView.selectedAnnotations.count is always 0. Because of this, I am unable to set my fullImageOfItem variable, which is then set to the detailCalloutAccessoryView a little farther down.
