App rotates to landscape and portrait, but won't rotate upside down
问题 When running a simple proof-of-concept iPhone app on my phone (iOS 13.1.2), it doesn't rotate upside down. It will rotate to either of the landscape orientations just fine, but not upside down. One strange thing is that there's also a UITextEffects window whose view controllers get supportedInterfaceOrientations called on them (and they return .allButUpsideDown , which matches with the observed behavior). The project is here, but I'll show all of the code inline. AppDelegate.swift: import