Thanks for your answer.
It's confirmed that each root view controller supports all orientation. When there is only one window, requestGeometryUpdate:errorHandler: works, but when I add an overlay window (supports all orientation) above it, only the overlay window can rotate.
Another problem is, if I try to rotate the view controller with supportedInterfaceOrientations + setNeedsUpdateOfSupportedInterfaceOrientations(), the overlay window can also cause those APIs to fail.
Haydenw
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution