Can you post a self-contained example, including the declaration of
NSFetchedResultsController?
Slava
> On Oct 6, 2017, at 11:28 PM, Glen Huang via swift-users
> <swift-users@swift.org> wrote:
>
> Hi,
>
> I defined some concrete classes inheriting from a generic class like this:
>
> class Controller1: NSFetchedResultsController<NSManagedObject> {}
> class Controller2: NSFetchedResultsController<NSManagedObject> {}
>
> And I assign them a shared delegate, and in the delegate method:
>
> func controllerWillChangeContent(_ controller:
> NSFetchedResultsController<NSFetchRequestResult>)
>
> I want to test the concrete type of controller, doing things differently for
> Controller1 and Controller2.
>
> But doing the following gives me a warning: Cast from
> 'NSFetchedResultsController<NSFetchRequestResult>' to unrelated type
> 'Controller1’ always fails
>
> switch controller {
> case is Controller1:
> // ...
> default:
> break
> }
>
> I wonder what’s the correct way to check the concrete type?
>
> Regards,
> Glen
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