Using dispatch_once_t per object and not per class

Question

There are multiple sources calling a particular method, but I would like to ensure that it is called exactly once (per object)

I would like to use syntax like

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Answer 1

dispatch_once() executes its block once and only once for the lifetime of an application. Here's the GCD reference link. Since you mention that you want [self _finishOnce] to happen once per object, you should not be using dispatch_once()