I encountered this today, and found that it was caused by loading a view controller from a storyboard by name... as the base view-controller class and not the derived class that it is specified as in the storyboard. So I understand why the overridden methods wouldn't get called. What I don't understand is why, when instantiated with the exact same method, some other derived controllers' overrides DO get called.

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Yep. Clearly this is a major issue. I did find an apparent workaround: Open up the xcodeproj as a directory and delete xcworkspace. That appears to fix it. Bug filed with Apple. Report this, folks: feedbackassistant.apple.com