There's a Steve Jobs story I heard once about getting the "wiggle" animation right for when apps are being deleted from the home screen. The animation wasn't perfect, so a custom version of the OS was built which included sliders for rotation, speed and other parameters. A few minutes of experimentation until it felt right, and out came the correct settings. How about being able to do that with your own apps? SwiftTweaks gives you an easy way to set it up. As mentioned in the article this is similar to the Objective-C Tweaks library, but for Swift.
Great article by Benjamin Encz on tracking down a performance problem inside UIKit. The problem itself is interesting (and may be affecting your apps!), but the detailed walk through the investigation process is where the article really shines.
Why use JSON or XML when we can store data in huge BLOBs? 💥 Well, there are some reasons and Russ Bishop starts by explaining why you might want to do it before digging into the how. Of course, there's UnsafeMutablePointer code in here and you should bear his warning in mind:
No one is too good to write a buffer overflow and that includes you.