Mapbox Navigation in iOS with in my mapView controller

I want to integrate Mapbox navigation in iOS, I can easily get the direction/route between two coordinate also to get the navigation path from mapbox we can use below code

let options = NavigationOptions(styles: nil)
let viewController = NavigationViewController(for: self.directionsRoute!)
viewController.delegate=self    
self.present(viewController, animated: true, completion: nil)

But the problem is I want to display the navigation in my mapview which is a part of another view controller, I can do that by getting a direction/route and instruction but I can't find any method which will be called every second so that I can update route instruction, as well as route, in case of user change the path.

Let me know if I am missing anything or any changes needed.

-Thanks in advance

from Mapbox Navigation in iOS with in my mapView controller