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아래 코드의 어설 션은 언제 시작됩니까?statusBarOrientation이 UIDeviceOrientation과 다른 점은 무엇입니까?
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
}