BufferedNavigationController
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UINavigationController that can queue concurrent animation changes without breaking the interface
BufferedNavigationController seems to be using delegate property itself. So, upon setting up a delegate to it, it does not do any transition. https://github.com/Plasma/BufferedNavigationController/blob/master/BufferedNavigationController.m#L32
on iOS7 if you pushViewController animated, and then popToRootViewController not animated, and then again pushViewController animated, you will see nested pop animation can result in corrupted navigation bar nested push...