Parse objects as AnnonationPoints - ios

Question

I'm trying to show a set of parse objects in a MKMapView as Annonations. This seem to work, the problem is that the objects images are swapped, which is kind of random? i've started creating a subclass of the MKPointAnnotation in order to save the image. How come the images are swapped around?
Custom MKPointAnnonation class
class AnnonationClass: MKPointAnnotation {
var itemId: NSString?
var itemImage: PFFile?
var itemdescription: NSString?
}
getting the parse objects and adding them using the setGeoPoint method
override func objectsDidLoad(error: NSError!) {
super.objectsDidLoad(error)
if error == nil {
self.pointMapView?.removeAnnotations(pointMapView?.annotations)
for object in objects {
var theObject = object as PFObject
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd" // superset of OP's format
let str = dateFormatter.stringFromDate(object.createdAt)
self.setGeoPoint(theObject.objectForKey("location") as PFGeoPoint, titleString: theObject.objectForKey("title") as NSString, imageFile: theObject.objectForKey("image") as PFFile, theId: theObject.objectId as NSString, descString: theObject.objectForKey("description") as NSString, dateString: str)
}
}
}
Setting the coordinates, title and saving the imageFile in the itemImage
func setGeoPoint(geoPoint:PFGeoPoint, titleString:NSString, imageFile:PFFile, theId:NSString, descString:NSString, dateString:NSString) {
var coordinate = CLLocationCoordinate2DMake(geoPoint.latitude, geoPoint.longitude) as CLLocationCoordinate2D
var pinView:AnnonationClass = AnnonationClass()
pinView.itemImage = imageFile
pinView.setCoordinate(coordinate)
pinView.title = titleString
pinView.subtitle = dateString
self.pointMapView!.addAnnotation(pinView)
}
creating the image and setting it
func mapView(mapView: MKMapView!, viewForAnnotation annotation: AnnonationClass!) -> MKAnnotationView! {
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
var leftImage: PFImageView = PFImageView(frame: CGRectMake(0, 0, 44, 44))
leftImage.file = annotation.itemImage
leftImage.loadInBackground()
pinView!.leftCalloutAccessoryView = leftImage
}
else {
pinView!.annotation = annotation
}
return pinView
}

Answer 1

In your viewForAnnotation, when pinView != nil, i.e. when reusing a view, it could well be that the image is set from the previous time that view was used. I think it is analogous to setting check marks on table view cells instead of using the data source to properly set properties for the cell contents.
Try setting the image view whether or not the pinView is reused.
func mapView(mapView: MKMapView!, viewForAnnotation annotation: AnnonationClass!) -> MKAnnotationView! {
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
}
var leftImage: PFImageView = PFImageView(frame: CGRectMake(0, 0, 44, 44))
leftImage.file = annotation.itemImage
leftImage.loadInBackground()
pinView!.leftCalloutAccessoryView = leftImage
return pinView
}