Thanks Nick.
On May 27, 2010, at 2:21 PM, Nick Zitzmann wrote:
>
> On May 27, 2010, at 2:58 PM, Tony Romano wrote:
>
>> Below is some code that handles mount and unmount notifications for volumes.
>> During an unmount, I want to remove the item from the NSTreeController's
>> arrangedObjects list. The mount sections works fine, it appends to the tree
>> any new volumes added. When I want to unmount it, I go through the process
>> of finding which NSTreeNode represents my object, get the index path to the
>> tree node and call removeObjectAtArrangedIndexPath:tn . This is where it
>> access faults. My debug output gives a valid row and the correct IndexPath.
>> I also verified via gdb console that the treenode is the correct item that
>> contains my object that represents the volume. Here is the call stack and
>> the code. Any ideas as to why it is crashing here?
>
> I do:
>
>> NSArray *childNodes = [[outlineController arrangedObjects]
>> childNodes];
>>
>> for (NSTreeNode *tn in childNodes) {
> [...]
>> [outlineController
>> removeObjectAtArrangedObjectIndexPath:path];
>> }
>> }
>
> If you're going to do something like that, then you need to work on a copy of
> the enumerated array. You cannot mutate collection objects that are being
> enumerated.
>
> Nick Zitzmann
> <http://www.chronosnet.com/>
>
>
-Tony
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