Search code examples
objective-cautomatic-ref-countingivar

Want to perform action when __weak ivar is niled

I have a @class Foo which contains a __weak id bar ivar. Several actions from methods in different classes can cause the object to disappear and thus get bar niled.

I want to perform an action when the ivar is automatically niled by ARC.

If possible, I would want to avoid turning bar into a property or using Key-Value Observing.

Is this even possible? If not, can KVO be used against non-property ivars?

Solution

  • KVO cannot be successfully used on non-property IVARs.

    You cannot detect from the runtime when Objective-C's ARC nils an IVAR.