On Nov 11, 2009, at 8:39 AM, David Catmull wrote:

> I'm getting a crash in -[NSTableView _isGroupRow:] in my unit tests if I try 
> to run the main run loop.
> 
> In my document's window, I have an NSOutlineView with its delegate and 
> dataSource set to the window controller. In some unit tests, I want to run 
> the main event loop to give some bindings a chance to do their thing, but 
> this causes a crash. Once, instead of crashing, there was a message logged 
> that some random class (whose name I can't remember) doesn't respond to 
> -[outlineView:isGroupItem:], as if the outline view's delegate were set 
> wrong. I added a check for that in the unit test and it was fine. When I run 
> the app normally everything works.

Your delegate is being deallocated too soon. Try adding a log when it gets 
dealloced (or a breakpoint) and see if the crash happens after the 
deallocation. It probably will.

--corbin





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