I realized I’d not posted some recent articles and tutorials I’ve written since I started tutorial for raywenderlich.com at the start of 2018.
IAP: Receipt Validation – I’m really happy with this look at a fairly complex task. Come for the cryptography and stay to learn about accessing C libraries from Swift.
Text Kit Tutorial: Getting Started – An update of an existing tutorial for latest versions of iOS and Swift.
Trigonometry for Game Programming – SpriteKit and Swift Tutorial: Part 1/2 and Trigonometry for Game Programming – SpriteKit and Swift Tutorial: Part 2/2 – Another update of an existing tutorial to the (at the time) latest XCode and iOS.