V2TimCallback

{
    code : int
    desc : String
}

      //设置信令监听器
     V2TimSignalingListener listener = V2TimSignalingListener(
      onInvitationCancelled:
          (String inviteID, String inviter, String data) async {
        //邀请被取消的回调
        //inviteID 邀请消息信令id
        //inviter 邀请人id
        //data 邀请被取消时的自定义data
      },
      onInvitationTimeout: (String inviteID, List<String> inviteeList) async {},
      onInviteeAccepted:
          (String inviteID, String invitee, String data) async {},
      onInviteeRejected:
          (String inviteID, String invitee, String data) async {},
      onReceiveNewInvitation: (String inviteID, String inviter, String groupID,
          List<String> inviteeList, String data) async {},
    );
    TencentImSDKPlugin.v2TIMManager
        .getSignalingManager()
        .addSignalingListener(listener: listener);

    V2TimCallback cancelRes = await TencentImSDKPlugin.v2TIMManager
        .getSignalingManager()
        .cancel(
          inviteID: "inviteID",//被取消邀请的id
          data: "");//取消邀请时附带的定义消息
    if (cancelRes.code == 0) {
      //取消成功
    }