Using objc_setAssociatedObject with weak references

Question

I know that OBJC_ASSOCIATION_ASSIGN exists, but does it zero the reference if the target object is dealloced? Or is it like the old days where that reference needs to get n

Answer 1

One more option similar to WeakObjectContainer:

- (id)weakObject {
    id (^block)(void) = objc_getAssociatedObject(self, @selector(weakObject));
    return (block ? block() : nil);
}

- (void)setWeakObject:(id)object {
    id __weak weakObject = object;
    id (^block)(void) = ^{ return weakObject; };
    objc_setAssociatedObject(self, @selector(weakObject),
                             block, OBJC_ASSOCIATION_COPY);
}