Under the hood: 3D transforms of iOS Views
summary
Explains how iOS applies 4x4 matrices to every view point and shows the concrete CATransform3D matrices for translations, scales and rotations, including why the extra row/column is needed; demonstrates the practical effect of m34 for perspective; shows a small open‑source dev tool called the design reviewer that screenshots a view and applies these matrices interactively, reproducing Xcode’s debug view hierarchy behavior, runs on older phones (used successfully on an iPhone 8) and ships code and writeups.
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chapters (7)
- 0:00Introduction and motivation
- 3:29Coordinate systems and Z-axis
- 8:28The role of matrix math
- 12:20Understanding translations
- 15:44Implementing scale transforms
- 18:45Rotations and trigonometry
- 25:38Advanced usage and conclusion
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