import UIKit

class ViewController: UIViewController {

    fileprivate func addImageView() {
//         Do any additional setup after loading the view, typically from a nib.
                NotificationCenter.default.addObserver(self, selector: #selector(ViewController.orientationChanged(_:)), name: UIDevice.orientationDidChangeNotification, object:nil)
                    }
            @objc func orientationChanged(_ notification: Notification){
                let device = UIDevice.current
                switch device.orientation
                {
                case .portrait:
                    print("面向裝置保持垂直，home鍵位於下部")
                case .portraitUpsideDown:
                    print("面向裝置保持垂直，home鍵位於上部")
                case .landscapeLeft:
                    print("面向裝置保持水平，home鍵位於右側")
                case .landscapeRight:
                    print("面向裝置保持水平，home鍵位於左側")
                case .faceUp:
                        print("裝置平放，home鍵朝上")
                case .faceDown:
                        print("裝置平放，home鍵朝下")
                case .unknown:
                        print("方向未知")
                }
        
        
    }


    override func viewDidLoad() {
        super.viewDidLoad()
         addImageView()
   }