swift-tutorial-17.swift

cr.calculateRoute(withStops: waypoints, routingMode: rm, completionBlock: { routeResult,error in
  if error == NMARoutingError.none || error == NMARoutingError.violatesOptions
  {
    if let r = routeResult?.routes[0] as? NMARoute
    {
      print("New route received")

      // when the route options were too restrictive for the route, we can still get a route back, but with violated options
      if error == NMARoutingError.violatesOptions {
        // use NMARoutingViolatedOption in NMARouteResult to get the violated options
        print("Violated \(routeResult?.violatedOptions.count) route options")
      }

      if self.mapRoute != nil {
          self.map?.remove(self.mapRoute)
      }

      self.mapRoute = NMAMapRoute(route: r)
      self.map?.add(self.mapRoute)
      self.map?.setBoundingBox(r.boundingBox, with: NMAMapAnimation.bow)
    }
  }
  else
  {
      print("ERROR: failed calculatig route: \(error.rawValue)")
  }
})