On Jul 23, 2009, at 5:05 PM, Ben Lachman wrote:
The problem I'm having is that I can't find a decent way of propagating index changes in the array controller back down to the model. Does anyone have a good method of doing this?
I usually get the array controller's -arrangedObjects as a mutable copy, move the objects in that array, then call a category method I wrote called -reeumerateObjectsByKey: which does as the name suggests. You then ask the array controller to -rearrangeObjects.
Essentially, you're reordering the objects in a "working array", then just rolling through each object setting the new [NSNumber numberWithUnsignedInteger:++index] for the passed in key.
There's probably a better way to do it, but it only took me a few minutes to dream it up and implement it as above and it works perfectly for me and is quite readable / maintainable.
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