Vlas Voloshin with an interesting exploration of a few private ARKit APIs that allow recording of session data. The best case for these APIs is that they weren't quite ready for iOS 12, and were pushed out to next year. The worst case is that they were developed for Apple's internal testing, and they'll stay private. Either way, as long as you don't ship code that uses them you can still use them in your internal testing!
After completing localisation of a new app, Eric Blair realised that while localisation hasn't changed fundamentally in a long time, the small changes have really added up. This article will bring you bang up to date with everything you need to know.
I really liked this article from Paul Samuels on testing for retain cycles in your Swift code. The concept is pretty simple, but the tips he gives here make testing for this really simple and something you could build into a more comprehensive test suite.
This article from Freya Holmér is wonderful. It's the clearest demonstration of how a Bézier curve works that I've ever seen. The tool that she built for visualising curves is also fantastic.
Every time I see a project with "Weekly" in the name, I think back to 2011 and remember thinking "How hard can it be to do something consistently on a weekly basis?" 😀 Every time I see a project start with "Daily" in the name, I feel for the author!