How to recompute Route in Sygic - swift

Question

my issue is simple I compute a primary route and I added it to Sygic MapView. I defined the startWay point and also the the end point. It works perfectly. But when I try to change to the alternative route when I started the navigation It can't recalculate perfectly the new route. I Used the
func navigation(_ navigation: SYNavigation, didUpdate positionInfo: SYPositionInfo?) {
to detect changes in my position and compute the route every time but I think is not the best choice:
func navigation(_ navigation: SYNavigation, didUpdate positionInfo: SYPositionInfo?) {
if (mapRoute != nil){
mapView.remove(mapRoute)
computeRoute(from: startPointMP, to: endPointMP)
}
}
func computeRoute(from fromCoordinate: SYGeoCoordinate, to toCoordinate:
SYGeoCoordinate) {
let startWaypoint = SYWaypoint(position: fromCoordinate, type: .start, name: "Begin")
let endWaypoint = SYWaypoint(position: toCoordinate, type: .end, name: "End")
let routingOptions = SYRoutingOptions()
routingOptions.transportMode = .unknown// For other options see SYTransportMode
routingOptions.routingType = .economic// For other options see SYRoutingType
routing.computeRoute(startWaypoint, to: endWaypoint, via: nil, with: routingOptions)
}
func routing(_ routing: SYRouting, didComputePrimaryRoute route: SYRoute?) {
SYNavigation.shared().start(with: route)
// You might want to put it also on the map
mapRoute = SYMapRoute(route: route!, type: .primary)
markerEnd = SYMapMarker(coordinate: endPointMP!, image: UIImage(named: "Arrive")!)
mapView.add(mapRoute)
mapView.add(markerEnd)
mapView.add(markerStart)
mapView.cameraMovementMode = .free
}