Re: Loading saved file into NSArrayController

FROM : mmalc crawford
DATE : Mon Feb 18 21:24:45 2008

On Feb 18, 2008, at 1:26 AM, Hans van der Meer wrote:

>>> It might be of use to remember that changes within an 
>>> NSMutableArray (addObject, remove...) do not by themselves lead 
>>> tot calling the class's observers. I found it useful to bracket 
>>> the changes in this manner:
>>> [self willChangeValueForKey:@"theArray"];
>>> // changes to the contents of the array
>>> [self didChangeValueForKey:@"theArray"];
>>>

>> Don't do this.
>> RTFineM.

>
> Please forgive me my ignorance. But I do not understand why the 
> change bracketing should not be done.


Because it says the whole array has changed, not the specific elements.
It's very inefficient.
For batch operations, see e.g <http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
>

mmalc