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Re: Read-only properties
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Re: Read-only properties


  • Subject: Re: Read-only properties
  • From: Roland King <email@hidden>
  • Date: Sun, 12 Oct 2008 23:56:42 +0800

well first off you're returning an NSArray which is immutable, so nobody can change the actual array itself, ie add or delete members (unless of course you really actually return a mutable one and the caller ignores the warnings and mutates it). If however you don't want the caller to modify the properties of the objects *in* the array, then unless those objects are immutable, returning a copy of the array won't help you anyway. Remember an array of objects is just an array of pointers to the objects in the array, a normal copy of that just copies the pointers and you can copy the array itself as much as you like and the objects inside it are still mutable.

So .. if you really don't want the objects themselves mutated you either need to make them immutable or take a look at deep copying them.


On Oct 12, 2008, at 11:44 PM, DKJ wrote:

I'd like to have something like this in my class:

	@property(readonly) *NSArray myArray;

But I don't want any of the individual objects in the array to be modified, so I'd like to return a copy of the array. Is there a way of getting @synthesise to ensure this? Or do I need to write my own getter method?_______________________________________________

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