On Jun 15, 2011, at 12:12, Luc Van Bogaert wrote:
> Because things still don't work, I have tried to visualize the responder
> chain by adding this into applicationDidFinishLaunching:
>
> NSResponder *nextResponder = [self.window nextResponder];
> do {
> NSLog(@"%@", [nextResponder class]);
> nextResponder = [nextResponder nextResponder];
> } while (nextResponder);
>
> This just returns one line of output: "null"
>
> So does this mean my window doesn't have a next responder? If so, I'm
> completely lost about why that would be. But of course that would explain why
> the validation methods are never called.
It sounds like you're thinking of the chain as running "down" from the window
to its subviews (and, potentially, the subview view controllers). It actually
runs in the other direction, "up" from window.firstResponder towards the window
object, and *ends* at the window. (I mean, the window-specific responder tree
ends there. The logical responder chain continues on to the window controller,
etc, just not using nextResponder links.)
If you want to see what (part of) the chain looks like, start your loop from
window.firstResponder.
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