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Editorial Team
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Asked: 2026-05-22T17:23:22+00:00

When some codes like this: objc_setAssociatedObject ( obj, &key, val, OBJC_ASSOCIATION_RETAIN ); Do I

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When some codes like this:

objc_setAssociatedObject (
  obj,
  &key,
  val,
  OBJC_ASSOCIATION_RETAIN
);

Do I need to call related

objc_setAssociatedObject (
  obj,
  &key,
  nil,
  OBJC_ASSOCIATION_RETAIN
);

to release the retained value? Does Objective-C runtime auto release the associative references in dealloc or somewhere?

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1 Answer

  1. Editorial Team

    Associated objects will be released when the parent object is deallocated. See the documentation here, specifically this example:

    At point 1, the string overview is still valid because the OBJC_ASSOCIATION_RETAIN policy specifies that the array retains the associated object. When the array is deallocated, however (at point 2), overview is released and so in this case also deallocated.

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