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

Swift 3.0 version of Nathan's answer (thank you Nathan):

DispatchQueue.main.async {
    mapView.addAnnotation(annotation)
}

Side note, Nathan's answer should have far more upvotes. I actually needed this help with removing an annotation, the same issue exists and is fixed by dispatching the update to the main queue.