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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
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Returns a new instance that's a copy of the receiver.
The copy() method comes from NSCopying -- a protocol built to do exactly what it implies: giving objects the ability to generate copies of themselves.
<NSCopying> Protocol and copyWithZone Method Implementation Now when executed, the above code creates a copy of the object referenced by account1 and assigns a pointer to the new object to variable account2.
copy is just short for copyWithZone:, 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 see copyWithZone: only within an implementation of copyWithZone:. similarly, you would typically avoid implementing copy, and just let the default implementation of copy call through copyWithZone:.
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