Why zone is always nil while implementing NSCopying?

Question

It may be simple question, but why implementing NSCopying protocol in my class, I get zone == nil

- (id)copyWithZone:(NSZone *)zone
{
    if (zo         


        

Answer 1

A NULL zone just means 'use the default zone'. Zones aren't used by the modern Objective C runtime anymore and cannot be used with ARC at all.

See documentation