On Sep 6, 2009, at 10:00 AM, Steven Degutis wrote:
For instance, if you have 2 genuine properties on your "Person"
entity called firstName and lastName then you can create a fullName
property
on your Person class, and when firstName or lastName change, call
-willChangeValueForKey: and -didChangeValueForKey: on "fullName" and
then
have your -fullName method return a concatenation of the first and
last
names.
This is at best misleading.
In this situation, you should typically not invoke the change
notification methods yourself; instead, you should set up dependent
keys as described in <http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/KeyValueObserving/Concepts/DependentKeys.html#//apple_ref/doc/uid/20002179-BAJEAIEE
>
mmalc
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