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Editorial Team
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Asked: 2026-06-06T06:41:35+00:00

Could you please clarify this part of Apple’s documentation: Transitioning to ARC Release Notes

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Could you please clarify this part of Apple’s documentation: Transitioning to ARC Release Notes – Frequently Asked Questions

How do blocks work in ARC?

Blocks "just work" when you pass blocks up the stack in ARC mode, such as in a return. You don’t have to call
Block Copy any more. You still need to use [^{} copy] when passing
"down" the stack into arrayWithObjects: and other methods that do a
retain.

What is passing blocks up and down the stack? Does it mean I would have to copy blocks I return from a function or method in MRC but in ARC I don’t have to?

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1 Answer

  1. Editorial Team

    What is passing blocks up and down the stack?

    They mean passing a block as a parameter to another method (or function) and returning a block as the result of a method (or function).

    Does it mean I would have to copy blocks I return from a function or
    method in MRC but in ARC I don’t have to?

    I believe that’s right.

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