April 26th, 2017
I saw the site raywenderlich.com made the videos of their RWDevCon 2016 conference freely available.
There are 24 videos to watch along with materials to download so you can follow along with the tutorials in the videos. The videos are a year old and use Swift 2 so you’ll have to convert the code to Swift 3 if you’re using Xcode 8. But the RWDevCon 2016 Vault looks like a great resource for people wanting to learn iOS development, Xcode tips, and Instruments tips.