Re: Detecting reading a key in KVC
Re: Detecting reading a key in KVC
- Subject: Re: Detecting reading a key in KVC
- From: Graham Cox <email@hidden>
- Date: Fri, 12 Nov 2010 09:57:43 +1100
On 12/11/2010, at 3:30 AM, Ken Thomases wrote:
> You should not override -setValue:forKey: or -valueForKey: if you can avoid it. Instead, implement the methods -setValue:forUndefinedKey: and -valueForUndefinedKey:. They are precisely for implementing "dynamic" properties in this manner.
Understood, but the OP's problem as I understand it is that it's not that the key is undefined, but the value associated with it is uninitialized. So rather than return nil, or zero, he wants to trigger a remote fetch of the value. KVC doesn't appear to provide a mechanism for that out of the box.
--Graham
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