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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copy
is 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 ofcopy
call throughcopyWithZone:
.