Firstly, my latest SpriteKit game written in Swift is now available on the App Store. It's called Hungry Bunny and is effectively an endless runner/skill test. It's free with ads.
Secondly, now that Hungry Bunny is complete I've returned to working on another project. This is nowhere near complete but I got to the point where I needed to securely store an OAuth2 token on iOS. I came across the Keychain API. However, the API for this was long winded and I only wanted to use it in a simple manner. Therefore I created a Swift framework to provide CRUD access to it along with a higher level interface where any type conforming to NSCoding and be saved, loaded & deleted.
This is available on github and also as my first ever CocoaPod. All the docs are in the README plus there's an example iOS program (Single View App) and the Unit Tests.