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?
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.