iOS refresh annotations on mapview

Question

I have a mapview where the annotation\'s coordinates are constantly being updated but when I use setCoordinate, the annotation does not move. How do I refresh the annotation

Answer 1

Dispatch the add annotation to the main thread rather then attempt to modify the UI on a background thread

dispatch_async(dispatch_get_main_queue()) {
    self.mapView.addAnnotation(annotation)
}