【Swift】监听耳机插入拔出的通知

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　　1、注册通知

NotificationCenter.default.addObserver(self, selector: #selector(audioRouteChangeListenerCallback(notification:)), name: AVAudioSession.routeChangeNotification, object: AVAudioSession.sharedInstance())

　　2、处理接收的通知

 @objc func audioRouteChangeListenerCallback(notification:NSNotification) {
        guard let userInfo = notification.userInfo,
            let reasonValue = userInfo[AVAudioSessionRouteChangeReasonKey] as? UInt,
            let reason = AVAudioSession.RouteChangeReason(rawValue:reasonValue) else {
                return
        }
        switch reason {
        case .newDeviceAvailable:
            //插入耳机时关闭扬声器播放
            self.agoraKit?.setEnableSpeakerphone(false)
        case .oldDeviceUnavailable:
            //播出耳机时，开启扬声器播放
            self.agoraKit?.setEnableSpeakerphone(true)
        default: ()
        }
    }

　　附：是否插入耳机

func hasHeadset() -> Bool {
        let audioSession = AVAudioSession.sharedInstance()
        let currentRoute = audioSession.currentRoute

        for output in currentRoute.outputs {
            if output.portType == AVAudioSession.Port.headphones {
                return true
            }
        }
        return false
    }