MKMapView extension with setVisibleMapAnnotations edgePadding animated helper in Swift

MKMapView (setVisibleMapAnnotations).swift

extension MKMapView
{
    func setVisibleMapAnnotations(edgePadding: UIEdgeInsets, animated: Bool)
    {
        var zoomRect = MKMapRectNull

        for annotationObject in annotations
        {
            let annotation = annotationObject as MKAnnotation
            let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)
            let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1)
            if (MKMapRectIsNull(zoomRect))
            {
                zoomRect = pointRect
            }
            else
            {
                zoomRect = MKMapRectUnion(zoomRect, pointRect)
            }
        }

        setVisibleMapRect(zoomRect, edgePadding: edgePadding, animated: animated)
    }
}