It's also hugely valuable to walk through "here's how UIKit is doing all this stuff." Abstractions aren't supposed to be magic.
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It would be awesome to see more material like this come from Apple. My perception is that a lot _is_ supposed to be magic.
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In the sense of: “Oh, how's this implemented?” “Don't worry about it.”
Obviously, don't depend on it, but that's different.
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I think there is a lot of small nuances to pick up from UIKit. I just hope it's all intentional ;)