Jonathan Wight with a neat tool comprising of a Value Transformer which takes in a simple subset of HTML and spits out an attributed string. Then a UILabel with an additional setMarkup: method finishes the job by allowing HTML to be set directly and rendered into the label. One point to note is that the parsing methods here work well on a background thread, unlike the NSAttributedString methods for parsing HTML.
It should come as no surprise that this post by David Rönnqvist is wonderful. As always it's not only the content that makes David's posts invaluable but the interactive diagrams and explanations that accompany them. Outstanding attention to detail backed up with great content, what more could you ask for?
There is a famous story of Steve Jobs being given an early build of iOS which included sliders to tweak the parameters of the "wiggle" animation which plays when an app is about to be deleted. This new library from Facebook allows you to add this kind of tweakability to your own apps. In the discussions on Twitter around this during the week, this alternate library also came up which is a much more lightweight solution to the same problem.
Date manipulation is rarely a fascinating subject but we all have to do it at some point. Matthew York has put together this extensive library for extending NSDate with all kinds of extra functionality.