Re: custom views, bindings, and array controller

FROM : Scott Stevenson
DATE : Sat Apr 30 01:34:33 2005

On Apr 29, 2005, at 3:31 PM, Josh Anon wrote:

> I didn't see this in the archives, but it feels like it should be an
> obvious question.  I have a custom view that displays a collection of
> objects.  I'd like to do something like NSTableView/NSTableColumn
> where I can just say "bind the text to an array controller's
> arrangedObjects.text and the label to arrangedObjects.label." 
> However, I don't see how the custom view will be able to get
> information from the array controller (selection, # objects, etc.)
> without specifying the array controller as an outlet.  I guess you
> could have a selection + objects array in the view that you bind the
> array controller's selection and arrangedObjects items to, but that
> seems more complicated than it should be.  Is there a clean way to set
> it up like NSTableView?


Hello Josh Anon,

You register for KVO notifications on the array controller inside bind:
and update the view's contents when observeValueForKeyPath: is called.
That method passes in the bound array controller, so you can just query
it directly for its new contents, using the key path specified during
the initial bind.


    - Scott

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