import CallKit

// 電話監(jiān)控
let callCenter = CXCallObserver.init()

// 設置代理
self.callCenter.setDelegate(self, queue: DispatchQueue.main)

// 實現(xiàn)代理方法
/*
     outgoing    // (bool)是否是自己撥打的
     
     onHold   //電話是否掛起
     
     hasConnected    //電話是否接通
     
     hasEnded    //電話是否結束
 
    */
func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {
      if call.hasConnected || call.isOutgoing || call.isOnHold {
          self.stopMusic()
      }else{
          self.startPlay()
      }
  }