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Re: Listening for changes

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Re: Listening for changes

Subject: Re: Listening for changes
From: Ken Thomases <email@hidden>
Date: Fri, 19 Dec 2008 11:35:45 -0600

On Dec 19, 2008, at 11:06 AM, Andre Masse wrote:

Let's say I have a class (called it Client) that has 25 fields and need to be notified when any of these is modified. Do I have to do - observeValueForKeyPath for each of the 25 fields?

You can add one "fake" property, use +keyPathsForValuesAffecting<Key> to tell KVO that all of your other keys affect the value of this one property, and then observe that one key.

On Tiger, you'd have to use +setKeys:triggerChangeNotificationsForDependentKey: to tell KVO about the dependencies.

Cheers,
Ken

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