handletap.swift

// Handle single taps
@objc @IBAction func handleMapTap(sender: UITapGestureRecognizer) {
    let point = sender.location(in: sender.view!)
    let coordinate = mapView.convert(point, toCoordinateFrom: mapView)
    points.append(coordinate)
    let annotation = MGLPointAnnotation()
    annotation.coordinate = coordinate
    mapView.addAnnotation(annotation)
}