How to move a MKAnnotation without adding/removing it from the map?

Question

Is it possible to move the coordinate of a MKAnnotation without adding and removing the annotation from the map?

Answer 1

Most answers are based on fact that your Annotation has been made via MKPlacemark extending. But what about any other object (i.e. custom image for marker) which only implements MKAnnotation protocol? It wouldn't have the setCoordinate method. So here is the answer based on code, provided by 100grams

    MKAnnotationView *av = [self.mapView viewForAnnotation:user];
    //user is an object which implements 
    // You will probably get your MKAnnotationView in your own way
    if (av){
        // here user returns CLLocationCoordinate2D coordinate  
        MKMapPoint mapPoint = MKMapPointForCoordinate([user getLastLocation]); 
        // converting mapPoint to CGPoint 
        CGPoint newPos;
        CGFloat zoomFactor =  self.mapView.visibleMapRect.size.width / self.mapView.bounds.size.width;
        newPos.x = mapPoint.x/zoomFactor;
        newPos.y = mapPoint.y/zoomFactor;
        // animation for annotation's move
        static NSString *POSITION_KEY=@"positionAnimation";
    static NSString *PATH_ANIMATION_KEY=@"position";
    if (MKMapRectContainsPoint(self.mapView.visibleMapRect, mapPoint)) {
        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:PATH_ANIMATION_KEY];
        animation.fromValue = [NSValue valueWithCGPoint:av.center];
        animation.toValue = [NSValue valueWithCGPoint:newPos];  
        animation.duration = 0.3;
        animation.delegate = av;
        animation.fillMode = kCAFillModeForwards;
        [av.layer addAnimation:animation forKey:POSITION_KEY];
    }
        // moving view
        av.center = newPos;

so You basically need to get the corresponding MKAnnotationView which could be also achieved by iteration via all of annotations and it's new location. I made an array holder for all of it (NSMutableArray *mapAnnotaions) so now I could iterate just like:

for (id annotation in mapAnnotaions) {call refresh method here for id}