Quand les assertions du code ci-dessous se déclencheront-elles?Quand statusBarOrientation est différent de UIDeviceOrientation?
let orien = UIApplication.shared.statusBarOrientation
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
switch UIDevice.current.orientation {
case .portrait: assert(orien == .portrait)
case .portraitUpsideDown: assert(orien == .portraitUpsideDown)
case .landscapeLeft: assert(orien == .landscapeRight)
case .landscapeRight: assert(orien == .landscapeLeft)
default: return
}