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override var shouldAutorotate: Bool {
        return false
}

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        NotificationCenter.default.addObserver(self, selector: #selector(QRCodeReaderViewController.onOrientationChange(_:)), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
}

deinit {
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
}

func onOrientationChange(_ notification: Notification){
        let deviceOrientation = UIDevice.current.orientation
        
        switch deviceOrientation {
        case .portrait:
            angle = 0
            
        case .portraitUpsideDown:
            angle = CGFloat(M_PI)
                        
        case .landscapeLeft:
            angle = CGFloat(M_PI_2)
                        
        case .landscapeRight:
            angle = CGFloat(-M_PI_2)
                        
        default:
            return
        }
        
        UIView.animate(withDuration: 0.2, animations: {
            self.view.transform = CGAffineTransform(rotationAngle: angle)
            self.view.frame = CGRect(x, y, width, height)
        })
    }