Finding Navigate driving directions using Google Maps in iphone

i'm developing an iPhone app which embed a mapView mad开发者_开发问答e with mkmapkit. I got two coordinates and I'm tracing the direction between these two points.But I need step by step directions

how can get this step by step directions if any one knows please help me .....

here i am attaching screen shot what i need:http://www.myappdemo.com/Screen%20shot.png

thanks for advance

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You can use google API for it.

http://maps.googleapis.com/maps/api/directions/xml?origin=Brooklyn,NY&destination=Manhattan,NY&sensor=false