c# - Parse.com - 如何统一制作回调函数？

Question

我是 Unity 新手，我不知道如何在 Unity 中创建 callBack 函数。 现在我正在做的是进行查询以从 parse.com 获取数据。数据获取正确，但在同一函数中，当我设置禁用/启用任何 gameobject 时，我收到主线程错误。确切的错误消息是:-

错误-

SetActive can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

我用来获取数据的以下代码/函数。

public void GetTop10ScoreClassic()
    {
        List<string> fbscores=new List<string>();
        List<string> fbplayer=new List<string>();
        int i = 0;
        int rank = 0;
//      Debug.Log (PlayerPrefs.GetString ("FBUserId"));
        Debug.Log ("Classic top 10 1");
        var query = ParseObject.GetQuery ("ClassicFacebookScore").OrderByDescending("score").Limit(10).WhereContainedIn("userId",FBLogin.friendIDsFromFB);

        query.FindAsync().ContinueWith(t =>
                                       {
            Debug.Log ("Classic top 10 2");


            comments = t.Result;
            Debug.Log(t.Result);

            foreach (var obj in comments) {
                i++;
                int score = obj.Get<int>("score");
                Debug.Log(score);
                string playerName = obj.Get<string>("playerName");
                Debug.Log(playerName);
                string playerId=obj.Get<string>("userId");
                Debug.Log(playerId);

                fbscores.Add(score.ToString());
                fbplayer.Add(playerName);

                if(playerId==userId)
                {
                    rank=i;// to highlight the user's score
                }
            }

            //enable the colliders
            foreach (BoxCollider2D colliders in Userrankscore.instance.myColliders)
                colliders.enabled = true;

            FbLeaderboard.instance.NetworkError = false;
            scoreapp42.instance.loadingwindow.SetActive (false);

                //Pass the list of score;
            App42Score.instance.list (fbscores,fbplayer,"fb",Convert.ToInt32(rank));


            if(t.IsFaulted)
            {
                //enable the colliders
                foreach (BoxCollider2D colliders in Userrankscore.instance.myColliders)
                    colliders.enabled = true;
                if(FbLeaderboard.instance.NetworkError)
                {
                    scoreapp42.instance.errorwindow.SetActive(true);
                    scoreapp42.instance.loadingwindow.SetActive (false);
                    Debug.LogError("Network Error");
                }

                foreach(var e in t.Exception.InnerExceptions) {
                    ParseException parseException = (ParseException) e;
                    Debug.Log("Error message " + parseException.Message);
                    Debug.Log("Error code: " + parseException.Code);
                }
            }
        });

    }

Answer 1

您不能从另一个线程调用统一函数。因此，如果您希望函数在主线程上运行，请执行以下步骤:

1.在场景中创建一个游戏对象并添加以下脚本:

公共(public)类DoOnMainThread:MonoBehaviour {

 public readonly static Queue<Action> ExecuteOnMainThread = new Queue<Action>();

 public virtual void Update()
 {
     // dispatch stuff on main thread
     while (ExecuteOnMainThread.Count > 0)
     {
         ExecuteOnMainThread.Dequeue().Invoke();
     }
 }

}

2) 每当你想像这样调用它时，将你的协程操作添加到队列中:

DoOnMainThread.ExecuteOnMainThread.Enqueue(() => { StartCoroutine(WaitAlertView4()); } );

它将在主线程下次有机会执行时执行，或者更确切地说，当游戏对象调用其更新方法时执行