There is an app, that should provide turn by turn navigation. At the moment it uses Google Map SDK and I was able to draw a route using Google Directions API and GMSPath using tutorial from AppCoda. Problem is it looks kind of ugly - simply thin blue line.
My questions is it possible create turn by turn navigation inside an app using Google Maps?
I think Google does provide this option but not for free.
Have a look at this: https://cloud.google.com/maps-platform/ridesharing/
来源：https://stackoverflow.com/questions/34723834/turn-by-turn-navigation-using-google-map-sdk-and-swift-in-ios-app