On Mar 8, 2010, at 10:58, David Blanton wrote:
> When I build and run the view is not visible. So I read about validating
> tool bar items:
>
> [snip]
>
> I have sub classed as suggested:
>
> @interface View : NSToolbarItem {
> @public
>
> }
>
> @end
>
>
> @implementation View
>
> - (void)validate {
>
> [self setEnabled:YES];
>
> }
>
> @end
>
>
> and set this class to be the class of the enclosing tool bar item:
> http://highrolls.net/Picture 2.png
>
> The buttons do not display.
Yes, but I don't see how you're getting from the view contents not being
visible to playing around with validation. Disabled buttons aren't invisible,
they're dimmed. Therefore, if they're invisible, it's unlikely that validation
is at fault. Or, at least, that isn't where I'd start looking.
> I then added outlets for the buttons and tried to enable them (yes, I realize
> that I if they were disabled I would see them in a disabled state) but I am
> grasping at straws now. Doing this caused EXEC_BAD_ACCESS the second time
> validate was called.
Yes, and it seems very likely that what's causing the crash at this point is
related to why the buttons aren't visible. Prime suspect is a memory management
error.
If, for example, a reference to the toolbar item's view isn't being retained
properly, the view and its contents would get deallocated. That would certainly
result in nothing being drawn, and would very likely cause the exact crash you
describe.
A repeatable crash is your best friend when trying to solve a problem like
this. If you find out why, the chances are you'll have found the original issue
too.
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