The beauty of programming languages is that you can implement it's core data structures using that programming language itself. Mike shows how to implement Swift Array and in the process goes into a lot of under the hood stuff that's worth knowing!
"Natalie" is a project from Marcin to save us from the String issue of strongly typed Swift Language.
You probably used Singleton before but have you used it with NSNumberFormatter? Adam shows you how to do it.
Jesse shows a use case where you can use Failable Initializers. Don't know about Failable Initializers? Here is the intro on official Swift blog.
If you're in the market for a collection of off-the-beaten-path hand-drawn fonts, you'll want to cast your eyes on this four-pack from Typesketchbook. From tall and condensed to big marker style, you'll have a wide range of typefaces to choose from.
Mike comments on what's wrong with UIView Spring animation in iOS and the alternatives you can use to fix it.
Eli writes about the threats that face design practitioners and the app industry.
Looking to respond to notifications through your code? This is a great post on how you can implement a reply to notification functionality in your app with code samples.
Bozho writes about how to schedule a task when the phone starts.
Unit Testing in Android is hard, Matthew tells you why and what you can do about it.
I never had to implement this but it looks like determining when an app is opened, re-opened or closed is hard with Android. The team at MeetMe helps us with the solution.
A great post on how to design settings for your app.
The designer at Soundwave writes about improving design with user testing.