Re: Bindings: is there a better way to observe when an object changes?
Re: Bindings: is there a better way to observe when an object changes?
- Subject: Re: Bindings: is there a better way to observe when an object changes?
- From: mmalc crawford <email@hidden>
- Date: Mon, 10 Sep 2007 11:24:57 -0700
On Sep 10, 2007, at 11:15 AM, Simone Tellini wrote:
NSEntityDescription is 10.4+, apart from that it could have been
what I was looking for.
I tried using -attributeKeys from NSClassDescription, but it always
returned nil.
Core Data doesn't provide "automatic" support for class descriptions:
"It is important to note that there are no class descriptions by
default. To use NSClassDescription objects in your code you have to
implement them for your model classes. For all concrete subclasses,
you must provide implementations for all instance methods of
NSClassDescription. (NSClassDescription provides only the
implementation for the class methods that maintain the cache of
registered class descriptions.) Once created, you must register a
class description with the NSClassDescription method
registerClassDescription:forClass:."
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSClassDescription_Class/Reference/Reference.html
>
You could use the entity description -- there are several ways to
retrieve the relevant information (e.g. [propertiesByName allKeys]),
but...
are you finding any other problems with this approach?
no, it works fine. I just don't think that it's very elegant ;-)
Anyway, I think that I'm doing the only possible thing at the
moment, so I'll stop wasting my time on it.
I wouldn't say you're "doing the *only* possible thing at the moment"
-- per Shawn's and my earlier replies, it may be that you can "future-
proof" your implementation by defining dependent properties for
attributes affecting drawing.
mmalc
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