> Le 3 sept. 2019 à 02:33, Turtle Creek Software via Cocoa-dev 
> <cocoa-dev@lists.apple.com> a écrit :
> 
> Thanks for all the suggestions for the problems we had with a controller
> being
> deallocated unexpectedly under ARC.  Unfortunately, none of them fixed it.
> 
> We do need to get back to regular app programming, so it will just stay a
> mystery.
> I was hoping we were doing something obviously dumb, but I guess the bug is
> more subtle.
> 
> The app runs OK with the old code with multiple strong references to it
> They are circular references, but that controller sticks around for the
> full app lifetime.  Presumably any leakage
> won't happen until late in the game, anyhow.
> 
> Thanks,

Just a last suggestion. How is you App delegate created ? Do you keep a strong 
ref on it. Else it will be deallocated and so will the controller.

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