如何使用AVFoundation检测单个Airpod被摘除？

import AVFoundation

// 创建音频会话
let audioSession = AVAudioSession.sharedInstance()

// 监听耳机插拔事件
NotificationCenter.default.addObserver(self, selector: #selector(handleRouteChange(notification:)), name: AVAudioSession.routeChangeNotification, object: nil)

// 处理耳机插拔事件
@objc func handleRouteChange(notification: Notification) {
    guard let userInfo = notification.userInfo,
          let reasonValue = userInfo[AVAudioSessionRouteChangeReasonKey] as? UInt,
          let reason = AVAudioSession.RouteChangeReason(rawValue: reasonValue) else {
        return
    }
    
    switch reason {
    case .newDeviceAvailable:
        // 耳机插入
        print("耳机插入")
    case .oldDeviceUnavailable:
        // 耳机拔出
        print("耳机拔出")
        
        // 检查AirPod是否被摘除
        if let outputs = audioSession.currentRoute.outputs as? [AVAudioSessionPortDescription] {
            for output in outputs {
                if output.portType == .headphones {
                    // AirPod没有被摘除
                    print("AirPod没有被摘除")
                } else if output.portType == .builtInSpeaker {
                    // AirPod被摘除
                    print("AirPod被摘除")
                }
            }
        }
    default:
        break
    }
}