初始化

import CallKitclass HomeViewController: UIViewController, CXCallObserverDelegate {public var cacheManager: TripCacheManager = TripCacheManager.init()override func viewDidLoad() {super.viewDidLoad()self.callObserver.setDelegate(self, queue: DispatchQueue.main)}
}

状态监听

func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {print("call observer uuid: \(call.uuid)")print("outgoing(拨打):\(call.isOutgoing) onHold(待接通):\(call.isOnHold) hasConnected(接通):\(call.hasConnected) hasEnded(挂断):\(call.hasEnded)")}
}

该方法不能通过单一状态来判断当前状态，建议进行多值的判断。

取消监听

self.callObserver.setDelegate(nil, queue: DispatchQueue.main)