Apps that are a wall of text are boring. Come and learn how much more cool stuff you can do with CALayers besides just rounding the corners. We’ll be going to space! We’ll set things on fire! We’ll disintegrate stuff! There will be rainbows! There will be confetti cannons! There will be graphs!
Yes – you can also learn some practical stuff. How do I stop layers from animating all the time? How many layers are too many? How complicated can these things get before performance starts to suffer?