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Q: 

UIView iPad orientation weirdness

When I receive a UIDeviceOrientationDidChangeNotification how do I tell if it's a portrait/landscape change or a face up/face down change?

I also receive notifications in between landscape/portrait changes such as when the device goes 45 degrees between landscape & portrait. I only care about changes from full 90 landscape/portrait changes and would like to discard all other changes without doing anything.

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