On Oct 2, 2015, at 15:03 , Jonathan Mitchell <[email protected]> wrote:
> 
> I am not disputing the veracity of the release notes!

When you first posted, I originally suspected (but had no specific knowledge) 
that the problem was your call to [super setView:] — specifically that this 
modified the responder chain, and that messed up what you were trying to do 
around it. I just checked the release notes, and they say this (in the part 
that you didn’t paste into your post):

> The following changes take effect for applications linked on 10.10 and higher:
> 
> • NSViewController automatically adds itself into the responder chain. When a 
> view is assigned, the view's current nextResponder is saved off. The view's 
> nextResponder is then set to be the viewController, and viewController's 
> nextResponder is set to be the previously saved nextResponder


“When a view is assigned” sounds to me an awful lot like “when 
[NSViewController setView:] is called”. You might have more success moving the 
super call to the beginning of your method, if you haven’t tried that already.

At a different level, though, I’d recommend you don’t do what you’re doing. My 
Apple tea-leaf reading instincts tell me that pretty soon you won’t have the 
choice of where to insert the view controller in the responder chain, so your 
methodology may not have long term survival prospects. 

Unfortunately, the problem you’re trying to solve is awkward to deal with. Your 
intention makes perfect sense, but it happens to be in direct conflict with the 
design of the responder chain. Your solution only works if there’s only *one* 
view controller (for a given action message) below the window controller. If 
there were multiple candidate view controllers, it’d be ambiguous which one 
should receive the action vs. which one would receive it. If there’s only one 
candidate, it’s straightforward for the window controller to know or be told 
which view controller handles which action message. I think you’re better off, 
long term, in simply putting the/an action method in the window controller, and 
letting the window controller call the view controller action method directly. 
(You’d also need the view controller to have a ‘canDoAction’ method, so that 
the window controller could query it during interface validation, if you want 
to keep your view controller logic partitioned neatly.)

FWIW.

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