On 07/05/2009, at 6:39 PM, Caleb Strockbine wrote:
Isn't that pretty much what +keyPathsForValuesAffectingValueForKey: is for? The parent object could observe a single property, such as 'modified', and any children would implement either +keyPathsForValuesAffectingValueForKey: or +keyPathsForValuesAffectingModified to return the set of the properties that would cause a child to be treated as modified. No utility method needed -- KVO does it for you.
I suspected it might be but frankly I found the documentation confusing and couldn't get it to work. Also, it's 10.5 only, though there is a deprecated older method that serves a similar purpose.
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