There is a much simpler alternative

[malhal]

Seems like you did a ton of work trying to solve this problem however you'll find this simple trick of setting the annotation again will cause it to update to the new coordinate:

MKAnnotationView* annotationView = [self.mapView viewForAnnotation:a];
a.coordinate = newCoordinate;
annotationView.annotation = a;

Furthermore if you want to animate the move just do:

[UIView animateWithDuration:0.5 animations:^{
a.coordinate = coordinate;
annotationView.annotation = a;
}];

FYI I saw you setting a mapView on your HGMovingAnnotationView causing a circular reference, tut tut you should be ashamed ;-)

[primedev-iOS]

Hey malcolmhall your logic seems alright there.
Can you please help me for my same problem?
I am working on app which will animate a annotation from one position to another live.Means I will receive coordinates from server in particular time manner.Please help me I in real trouble.:(

[ekimia]

@MalcolmHall the annotationView.annotation = a; part isn't needed :)