Does the Dropbox Sync API use API v1?

It is my understanding that Sync uses v1, and therefore it will cease to function on June 28, 2017.  My app used Sync on both Android and iPhone.  I have already changed my Android app to use Core API v2, which means I had to give up the background file syncing and caching and use only explicit and immediate uploads and downloads of files.  My customers will notice, but I don't think they will mind too much.  The iPhone version of my app is waiting for the Objective-C library for Core API v2, which is due out this month, so they say.  I will make the same change there, once that library is released.