Bindings help

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Lorenzo Thurman - 14 Feb 2008 15:10 GMT

I've used cocoa bindings for preferences, but this is my first serious
use of Bindings, so here's my problem:
I have a window with an attached drawer. The drawer contains an
NSTableView which I want to display data stored in some NSDictionarys
contained in an NSArray. The dictionaries are obtained from an XML
document parsed with NSXMLParser. Each dictionary contained in the
array, constitutes a row in the table. I've read through the docs at
Apple's site and looked through some examples here:
http://homepage.mac.com/mmalc/CocoaExamples/controllers.html

But I'm still confused. Should I use an NSObjectController and an
NSArrayController, just an NSArrayController or do I need either at all?
When I tried working with both an NSObjectController and an
NSArrayController, I got various errors like these:

Internal consistecy error: this value is not key value coding compliant
for the key cities
(cities was the name of my NSArray)

When connecting things in IB3, I connected the NSObjectController to my
controller class which contains my NSArray as an outlet. Then I bound my
NSArrayController to my NSObjectCOntroller's selectedObjects.

Can anyone provide me with any tips on how to do this?
Thanks

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Lorenzo Thurman - 17 Feb 2008 02:42 GMT

> I've used cocoa bindings for preferences, but this is my first serious
> use of Bindings, so here's my problem:
[quoted text clipped - 21 lines]
> Can anyone provide me with any tips on how to do this?
> Thanks

I figured it out. No, I don't need an objectcontroller, just the
arraycontroller. I bound the arraycontroller to my controller object
with a keypath using the array that actually holds the data.
Simple.

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ibloom - 24 Feb 2008 03:52 GMT

On Feb 16, 9:42 pm, Lorenzo Thurman <lore...@diespammerhethurmans.com>
wrote:

> > I've used cocoa bindings for preferences, but this is my first serious
> > use of Bindings, so here's my problem:
[quoted text clipped - 26 lines]
> with a keypath using the array that actually holds the data.
> Simple.

I'm doing something similar and I'm trying to understand:
I've bound an NSArrayController to NSApplication which delegates
arrayContent to my AppDelegate class, it calls a method to retrieve a
list of dictionaries.
This all works just fine.
But I can't figure out, when I load a new XML file I want the
NSArrayController to read a new dictionary by calling my method again.
How do I tell it to do this??

Ian Bloom

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Mac Forum / Programming / Mac Programming / February 2008

Bindings help