@IBAction func showLocation(_ sender: UIBarButtonItem) {
   if let current = route {
      let distance = current.distance
      let time = current.expectedTravelTime
      var message = "Distance: \(distance) meters \r\n"
      message += "Time: \(time) seconds"
            
      let alert = UIAlertController(title: "Route", message: message, preferredStyle: .alert)
      let action = UIAlertAction(title: "OK", style: .default, handler: nil)
      alert.addAction(action)
      present(alert, animated: true, completion: nil)
   }
}