Swift 接受呼叫后使用openTok（CallKit）

我正在做一个需要opentok和callkit通知用户的项目。但是，当openTok尝试连接到会话时，应用程序不断崩溃。我知道现在发生了什么。以下是我的工作流程和代码：

推送有关可用opentok会话的通知->启动来电->用户接受呼叫->启动opentok脚本->做一些后端工作->连接到会话！！！！这是它崩溃的时候

错误： 线程1:EXC\u坏访问（代码=2，地址=0x1968a0ad8）

此外，我想征求关于接收通知的建议。而不是在屏幕上显示通知。我想开始通话，使用callkit，如whatsapp或fb messenger。请也给我一个提示。现在，我只能在发送推送通知时，应用程序处于前台时启动呼叫

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    // If you are receiving a notification message while your app is in the background,
    // this callback will not be fired till the user taps on the notification launching the application.
    // TODO: Handle data of notification
    // With swizzling disabled you must let Messaging know about the message, for Analytics
    // Messaging.messaging().appDidReceiveMessage(userInfo)
    // Print message ID.
    if let messageID = userInfo[gcmMessageIDKey] {
        print("Message ID: \(messageID)")
    }

    // Print full message.
    print(userInfo)

    let aps = userInfo["aps"] as! [String: AnyObject]
    // 1
    if aps["content-available"] as? Int == 1 {

        let uuid = UUID(uuidString: MyVariables.uuid)
        AppDelegate.shared.displayIncomingCall(uuid: uuid!, handle: "Sanoste", hasVideo: false) { _ in
        }
    }else  {
        return
    }

    completionHandler(UIBackgroundFetchResult.newData)
}


func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {

    action.fulfill()
    AppDelegate.shared.openTok()
}


func openTok() {

    let mainStoryboard = UIStoryboard(name: "callView", bundle: nil)
    let vc = mainStoryboard.instantiateViewController(withIdentifier: "callViewController") as! callViewController

    vc.view.frame = UIScreen.main.bounds
    UIView.transition(with: self.window!, duration: 0.5, options: .transitionCrossDissolve, animations: {
        self.window!.rootViewController = vc
    }, completion: nil)

}

// Join a session from MBE
func joinSession() {

    var error: OTError?

    pSession = OTSession(apiKey: openTokSessionKey.pApiKey, sessionId: openTokSessionKey.pSessionId, delegate: self as OTSessionDelegate)
    pSession?.connect(withToken: openTokSessionKey.pToken, error: &error)
    if error != nil {
        print(error!)
    }

    sSession = OTSession(apiKey: openTokSessionKey.sApiKey, sessionId: openTokSessionKey.sSessionId, delegate: self as OTSessionDelegate)
    sSession?.connect(withToken: openTokSessionKey.sToken, error: &error)
    if error != nil {
        print(error!)
    }
}

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有人帮忙吗

这次撞车是一种警告。如果您在Xcode 9的项目设置中禁用“主线程消毒器”并重新生成项目，则可以修复此问题。

您好，感谢您的回复。然而，这并没有解决问题。我用旧设备进行了测试。显然，问题在于iOS11 beta 4本身。它适用于beta 3或更低版本。