In case anyone stumbles across this question looking for an Apple Game Dev book, here is one that is complete and in beta, and the hardcopy will be out April 2021: Apple Game Frameworks and Technologies: Build 2D Games with SpriteKit & Swift
by Tammy Coron. h ttps://pragprog.com/titles/tcswift/apple-game-frameworks-and-technologies/ Full disclosure: I edited the book, which is how I know about it.
margarete
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