The article to read when you get lost in Device Orientation

You can get the orientation of device by “UIDevice.current.orientation” , but it returns .unKnown when the app has just be launched.

In these case, use UI Interface Orientation instead.

iOS12 or earlier

UIApplication.shared.statusBarOrientation

iOS 13 or later

self.view.window?.windowScene!.interfaceOrientation

*However, because it is the orientation of the interface on the screen
If you check the UIInterfaceOrientation when the view does not appear, it will be nil.
Make sure to check between viewDidAppear ~ viewWillDisAppear.
Also, the orientation cannot be recognized when it is laid down (.faceUp, .faceDown).

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