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Understanding the iOS Layer Drawing & Display Hierarchy – A Detailed Look Behind the Scenes

The first time I was confronted with the need to do some custom drawing in my iOS app, I spent longer understanding and deciding how to begin than I did actually doing the drawing code itself. Through much trial and error, and many pages of Apple docs and Stack Overflow posts, I journeyed through a steep, though ultimately satisfying, learning curve about how the CALayer drawing methods fit together.

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