While I am using Google Maps SDK, I am trying to get driving direction between two locations on iOS. I know we can do this using two methods:-
1.) Using URL Scheme,
It sounds like you are looking for UI Chrome like the Google Maps app has for showing directions. Google Maps SDK for iOS will paint you a map, but you are responsible for the additional navigation chrome.
You can use the Google Directions API to request directions, and then use the encoded path returned from the service to draw a GMSPolyline using GMSPath's pathFromEncodedPath: method.