I know that copy creates an immutable copy of an object but i just want to know how copywithzone works and what is the basic difference between copy and copywithzone
What is the difference between "-copy" and "-copyWithZone:"?
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copyis just short forcopyWithZone:, using the default zone.it's rare that you would call
copyWithZone:directly, although defining/implementing it is required in order to adopt@protocol NSCopying. so you would normally seecopyWithZone:only within an implementation ofcopyWithZone:. similarly, you would typically avoid implementingcopy, and just let the default implementation ofcopycall throughcopyWithZone:.