I have checked and edited the plist file, but the result has not changed. Result is the application in horizontal state on the ipad, but rotate button is clicked, the rotation event still doesn't work. (happens with ipad only, on iphone is works fine.)

@Claude31: Note: why not support iPad deployment ? Reason that we can't prepare the specific design for the ipad, we can only scale it from iPhone's design. I tried with a new project with the above settings, but it still can't rotate the screen. when clicking on the event of the button absolutely nothing happens. Rotate Button's action    @IBAction func rotation(_ sender: Any) {     ScreenOrientationManager.shared.rotateScreen()   }