Re: Manual KVO and will/didChangeValueForKey
Re: Manual KVO and will/didChangeValueForKey
- Subject: Re: Manual KVO and will/didChangeValueForKey
- From: Tim Lucas <email@hidden>
- Date: Thu, 2 Jun 2005 22:08:37 +1000
On 02/06/2005, at 9:48 PM, Scott Anguish wrote:
On Jun 2, 2005, at 2:51 AM, Tim Lucas wrote:
On 02/06/2005, at 3:47 PM, Andrew White wrote:
I'd like to be able to mirror the will/did messages from otherclass
in this class. I'd also like to make sure that I don't update data
twice in observeValueForKeyPath:ofObject:change:context:, once on
the willChangeValueForKey and once on the didChangeValueForKey.
I think willChangeValueForKey: just gives the any NSEditor's the
chance to finish their editing (anybody confirm this?) -- it won't
send out a KVO change notification.
actually, every will must be matched with a did, or things won't
work well.
Sure, though my question was more to the purpose of the willChange:,
Andrew's question being whether you can be notified of the willChange:
call.
From the docs:
- (void)willChangeValueForKey:(NSString *)key
Invoked to inform observers that the receiver is about to change the
value of key. ...
How do the observers get informed of this impending change?
- tim lucas
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