viewDidUnload
Both viewDidUnloadand are viewWillUnloadno longer called by iOS6. The Xamarin release notes for MonoTouch 6 describe this, as well as the Apple documentation .
shouldAutorotateToInterfaceOrientation
Two new methods (in iOS6 available in MonoTouch) can be overridden to get the same result. See the Apple documentation for the selector for more details shouldAutorotateToInterfaceOrientation.
, shouldAutorotateToInterfaceOrientation ( , , iOS).