On Apr 16, 2012, at 7:34 PM, Quincey Morris wrote:
> Yes, that's an awkward case. Although a NSViewController *is* a responder, it
> *isn't* automatically added to the responder chain. Therefore it cannot be
> found as first responder, and so its action method is not recognized by menu
> validation. :)
>
> You can manually add the view controller to the responder chain if you want,
> in loadView perhaps. However, I've never quite figured out all the places
> where I'd need to manually remove it again. (If you're not swapping views,
> then maybe you don't need to worry about that -- just leave it there until
> the responder chain gets pruned in the normal course of events.)
>
> Otherwise, you have to move the validation code to the window controller (or
> whatever object can receive the validation request), *and* put a duplicate
> 'delete:' action method in the window controller, *and* have it call the view
> controller's 'delete:' method.
>
> Another alternative might be to implement 'delete:' in the view itself (if
> you can use/are using a custom view subclass), and delegate both the
> validation and the invocation to the view controller.
>
> Sorry, I don't know of a cleaner way. Maybe someone else will jump in with an
> improved solution.
So, I solved it as follows. I created a deleteObjects IBAction in my
AppController class invoked by the delete menuItem. To remove the objects, I am
more or less following the code in Hillegass' book, chapter 15 on NSAlerts.
In this example, the line
[employeeController remove: nil] is used to remove the selected objects
(employees)
However in my app it didn't remove anything (the code was called, though).
After some searching, I ended up doing the following:
for (Employee *employee in employeeArrayController.selectedObjects)
{
[[self managedObjectContext] deleteObject: employee];
}
It seems to work, but just to be sure I am checking here to see if this is
indeed the correct approach?
Thanks,
- Koen.
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