swift4.2 - 距离传感器

 

 

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import UIKit   class ViewController: UIViewController {       deinit {         NotificationCenter.default.removeObserver(self)     }     override func viewDidLoad() {         super.viewDidLoad()                  //开启距离传感器功能         UIDevice.current.isProximityMonitoringEnabled = true                   //监听物体开进或离开设备的通知         NotificationCenter.default.addObserver(self, selector: #selector(statusChange), name: UIDevice.proximityStateDidChangeNotification, object: nil)               }       /// 这个主要在 手机上方，电话听筒有相应  = =  下面没得反应     @objc func statusChange(){         //获取当前是否有物体靠近设备                   if UIDevice.current.proximityState {             print("大佬来了")         }else{             print("大佬走了")         }     } }