How CGAffineTransform actually works — Swift engineer’s guide
summary
Explains how CGAffineTransform works in UIKit for Swift engineers, detailing how scale, rotation and other transform initializers map to the matrix components a, b, c, d, tx, ty. Uses basic linear algebra (only arithmetic) to show why combined transforms can behave unexpectedly and how to interpret and predict transform results.
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chapters (9)
- 0:00Introduction
- 2:04What is CGAffineTransform
- 4:57Affine as matrix ops
- 7:34Matrix multiplication
- 10:113x3 matrices for affine
- 12:08Order matters
- 15:27Reverse order quirk
- 17:43Fixing reverse order with concat
- 18:26Summary
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