passiveGetHeadsetPlugIn.swift

NotificationCenter.default.addObserver(self, selector: #selector(audioRouteChange(_:)), name: .AVAudioSessionRouteChange, object: nil)

@objc func audioRouteChange(_ notification: Notification) {

    guard let userInfo = notification.userInfo,
    	  let rv = userInfo[AVAudioSessionRouteChangeReasonKey] as? UInt,
          let reason = AVAudioSessionRouteChangeReason(rawValue: rv) else { return }

    switch reason {

    case .newDeviceAvailable:
        let audioOutputs = AVAudioSession.sharedInstance().currentRoute.outputs
        for output in audioOutputs where output.portType == AVAudioSessionPortHeadphones {
            print("耳機已插入耳機孔")
        }

    case .oldDeviceUnavailable:
        guard let previousRoute = userInfo[AVAudioSessionRouteChangePreviousRouteKey] as? AVAudioSessionRouteDescription else { return }
        for output in previousRoute.outputs where output.portType == AVAudioSessionPortHeadphones {
            print("耳機已拔出耳機孔")
        }

    default:
        break
    }
}