As we heard Apple was experementing Nastaleeq font for Urdu in iOS 9 beta but we did not see it in the final release. On the other hand, Apple has added Urdu support for localized Urdu apps and websites.
How to change to Urdu in iOS 9?
To see your iPhone, Instagram, Google search, WhatsApp and Twitter partially in Urdu (push notifications), set Urdu as first preferred language in your iPhone’s language settings.
Here you go.