func zoomMap()
{
    map.showAnnotations(map.annotations, animated: false)

    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1)
    {
        let rect: MKMapRect = self.map.visibleMapRect
        let padding: UIEdgeInsets = self.edgePadding
        self.map.setVisibleMapRect(rect, edgePadding: padding, animated: false)
    }
}