Re: Detecting reading a key in KVC
Re: Detecting reading a key in KVC
- Subject: Re: Detecting reading a key in KVC
- From: Lee Ann Rucker <email@hidden>
- Date: Thu, 11 Nov 2010 15:31:53 -0800
- Acceptlanguage: en-US
- Thread-topic: Detecting reading a key in KVC
On Nov 11, 2010, at 2:57 PM, Graham Cox wrote:
>
> 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.
There's setNilValueForKey: though it's only for scalars._______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden