Swift: Rotate Buttons Based On Device Orientation

rotate_buttons.swift

override func viewDidLoad()
{
   super.viewDidLoad()
   NotificationCenter.default.addObserver(self, selector: #selector(rotate), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
}

@objc func rotate()
{
    var rotation_angle: CGFloat = 0
        
     switch UIDevice.current.orientation
     {
         case .landscapeLeft:
             rotation_angle = (CGFloat(Double.pi) / 2)
         case .landscapeRight:
             rotation_angle = (CGFloat(-Double.pi) / 2)
         case .portraitUpsideDown:
             rotation_angle = CGFloat(Double.pi)
         case .unknown, .portrait, .faceUp, .faceDown:
             rotation_angle = 0
      }

      UIView.animate(withDuration: 0.2, animations:
      {
          // WHATEVER YOU WANT TO ROTATE HERE
          self.SharingButton.transform = CGAffineTransform(rotationAngle: rotation_angle);
            
      }, completion: nil)
}