Some time ago I mentioned the RxSwift library providing extensions to the Swift programming language for functional reactive programming.
Łukasz Mróz from The Droids on Roids has written a nice set of tutorials for those looking to get into functional reactive programming in Swift with numerous examples.
You can find the tutorials over on the Droids on Roids blog in 3 parts:
RxSwift Part 2 – Observables and the Bind
RxSwift Part 3 – Examples and Networking
A nice guide to understanding RxSwift.