Deep, practical issues on Apple’s UI frameworks: Core Graphics, Core Animation, Core Image, Core Text, and SwiftUI. Every issue lands in your inbox first and in the archive below, each with a downloadable PDF.
The current transformation matrix is the quiet state that decides where every point you draw lands. Swap two lines and the picture moves. Here is exactly why, drawn twice, measured, and reproducible in 54 lines of Core Graphics.
A field guide to Core Graphics, Core Text, Core Image, Core Animation, and SwiftUI, illustrated by an engine that draws every picture twice, once with a clean-room renderer, once with Apple's.