Curtis Herbert on implementing subscription pricing in Slopes. It's a detailed post covering not only the implementation process but some of the issues he ran into. For example, there's no way for your app to determine the subscription end date when auto-renew is turned off, which is something your users would almost certainly appreciate seeing. If you're considering subscription pricing, you'll want to read this.
Chris Dzombak on the difficulties of dependency injection with view controllers. I'm not sure I'd go as far as declaring them broken, but there's certainly plenty of room for improvement. He talks a little about SwiftGen (mentioned above), and also the new Perform library by Adam Sharp. Ultimately though, he's right that no one but Apple can fix this.
Paul Hudson on the new haptic APIs introduced alongside the iPhone 7 last night. There's currently no way to test these until the new hardware arrives, but you can start getting ready for them! The HIG has also been updated to include some guidance on this new feedback mechanism.
Rob Napier on the subtleties of copying and pasting. He's absolutely right, of course! 👍