Re: Bindings
Re: Bindings
- Subject: Re: Bindings
- From: Chris Hanson <email@hidden>
- Date: Sat, 26 May 2007 19:07:15 -0700
On May 26, 2007, at 6:20 PM, Sandro Noel wrote:
ok here is my case.
I have a NSMutableArray of NSNetService
Stop right here. Do you know whether NSNetService supports Key-Value
Observing? This is a requirement for anything you wish to bind to.
As someone put it not too long ago on the list (diagram reproduced
from memory):
Change in model object uses KVO to propagate through controller
objects to view objects:
Model o----[KVO]--->> Controller o----[KVO]--->> View
Manipulation of view uses KVC to push changes through controller
object to model object:
Model <----[KVC]----o Controller <----[KVC]----o View
When a model object changes, it posts KVO notifications. If a view is
bound to a model object (via a controller, of course) it will get them
via the controller. When a user manipulates a view object, the view
object uses key-value coding to push those changes through its
controllers to the appropriate model object.
This means that anything used in bindings will have to be KVC and KVO
compliant.
Another important question: Do you consider NSNetService instances to
be model objects in your application? For the vast majority of
applications -- even in the case of something like Xcode's Distributed
Build preferences -- the answer is likely to be "No."
I think you would probably be better off creating your own model class
that supports Key-Value Observing, and which represent the actual
model of your application. Then instances of this class can either
*use* NSNetService instances or be *managed by* something that uses
NSNetService instances to locate services via Bonjour.
-- Chris
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| References: | |
| | >Bindings (From: Sandro Noel <email@hidden>) |