There is a bug with the addRoute() of the Map View in iOS,
To test this open the Kitchen Sink.
- Base UI
- Map View with Routing
You can see on the left side of the MapView that some of the route is missing. You can tell because as soon as you move the map, the missing section of the route appears.
There is a helpdesk ticket that encounter this: http://support.appcelerator.com/tickets/APP-997833