Radek follows up on his Swifty Methods article on naming and verbosity in Swift that I linked to in Issue 164. This time he provides a concrete example of how a class like NSUserDefaults could be polished and make use of Swift's features to reduce verbosity and increase clarity. He implements a wrapper around NSUserDefaults and I think it only takes one look at the results to agree it's a huge improvement.
Yari D'areglia with a great article analysing the animations on the profile view in the official Twitter client. There are some beautiful, subtle animations here and this post breaks them down, then re-implements them. I love analysing animations like this and turning what seems like an extremely complex effect into 3 or 4 simple animations.
Daniel Jalkut breaks down a complicated refactoring into small predictable steps, moving from a custom CFNetworking implementation to NSURLSession. Daniel's approach of using the existing test suite to effectively run his tests twice against different classes is great. Don't miss the follow up discussion with Brent Simmons as well.
A nice tip for closures in Swift from Russ Bishop. You can create new named values in the capture list of a closure which allows you to avoid creating many references in the surrounding code.