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

NSZone was deprecated a long time ago. The fact that it's still in method signatures (e.g. +allocWithZone: and -copyWithZone:) are for backwards compatibility.