iOS：监听手机方向

import UIKit
 
class ViewController: UIViewController {
 
  
    override func viewDidLoad() {
        super.viewDidLoad()
      //各个方向监听
       NotificationCenter.default.addObserver(self, selector:     #selector(ViewController.orientationChanged(_:)), name: UIDevice.orientationDidChangeNotification, object:nil)
      //状态栏方向改变
       NotificationCenter.default.addObserver(self, selector: #selector(didChangeStatusBar), name: UIApplication.didChangeStatusBarOrientationNotification, object: nil)
       }

    @objc func orientationChanged(_ notification: Notification){
                let device = UIDevice.current
                switch device.orientation
                {
                case .portrait:
                    print("面向设备保持垂直，home键位于下部")
                case .portraitUpsideDown:
                    print("面向设备保持垂直，home键位于上部")
                case .landscapeLeft:
                    print("面向设备保持水平，home键位于右侧")
                case .landscapeRight:
                    print("面向设备保持水平，home键位于左侧")
                case .faceUp:
                        print("设备平放，home键朝上")
                case .faceDown:
                        print("设备平放，home键朝下")
                case .unknown:
                        print("方向未知")
                }
        
        
         }

   @objc func didChangeStatusBar(){
             
    
    }

}