When implementing this method of NSCopying in a class to enable copy, what is the zone param use ? If I set a new object, I do not need to alloc it with allocWithZone as an alloc is just enough... I'm confused...
iPhone : (id)copyWithZone:(NSZone *)zone : what is "zone" for?
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It's a relic from the old days, where we had multiple "zones" to allocate in. These days, all apps only have a single zone where all allocations are made, but the
NSZoneclass still exists and far too much code is written to depend on+allocWithZone:being the fundamental allocation method to make the change.In short, you can ignore the
NSZonestruct in its entirety, and the only reason to care about+allocWithZone:is if you need to override it. Similarly with-copyWithZone:, you can just ignore the zone. If you so desire, you can call+allocWithZone:passing in the same zone, but it won't make any difference.