Re: Problems with bindings and "continuously updates"
Re: Problems with bindings and "continuously updates"
- Subject: Re: Problems with bindings and "continuously updates"
- From: "I. Savant" <email@hidden>
- Date: Thu, 18 Oct 2007 11:04:13 -0400
> I'm having some troubles with some read-only bindings. I have
> several NSString values that are composites of other values (so
> there's no setMyStringValue method, just a myStringValue method), and
> they are not being checked properly by the text fields that are bound
> to them, even when I have "Continuously Updates Value" checked.
You should (re?)read the Key Value Observing Programming Guide:
http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueObserving/index.html
... as this information is covered there. In a nutshell, you need to
implement the method:
+setKeys:triggerChangeNotificationsForDependentKey:
... and register dependent keys. For example, changes to -firstName
and -lastName should trigger an update on -fullName. As to where to
implement this and how, read the docs, search Google; the answers are
there once you know what to look for.
--
I.S.
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