Next Door / Sessions / Mike Ash

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    A Tour of the Objective-C Runtime API


    The Objective-C runtime is at the heart of the language, and is still heavily involved in Swift. We'll take a look at exactly what the Objective-C runtime is, how it works, how it ties into Swift, and what you can do with it. We'll finish up with an instruction-by-instruction walkthrough of the objc_msgSend function that drives every square bracket expression you write.