Unity-Firebase实时数据库-在页首横幅中排名 [英] Unity - Firebase realtime database - Get my rank in leaderboard

问题描述

我有一个带有排行榜的迷你游戏，使用的是实时Firebase数据库.

I have a mini-game with a leaderboard using firebase database realtime.

从firebase获得用户得分列表之后，我想获得不在列表中的当前用户的分数.

After I got list of user-score from firebase, I would like to get the score of the current user who was out of the list.

很容易获得当前用户的得分，但是如何知道列表中的排名为OrderByChild("score").

It's easy to get the score of the current user but how to know the rank in list which was OrderByChild("score").

这是获得排行榜的代码.

This is the code to get the leaderboard.

List<UserScore> leaderBoard = new List<UserScore>();
FirebaseDatabase.DefaultInstance
                .GetReference("user-scores")
                .OrderByChild("score")
                .LimitToLast(10)
                .GetValueAsync()
                .ContinueWith(task =>
        {
            if (task.IsFaulted)
            {
                Debug.Log("Fail To Load");
            }
            else if (task.IsCompleted)
            {
                DataSnapshot snapshot = task.Result;
                foreach (DataSnapshot h in snapshot.Children)
                {
                    UserScore userScore = new UserScore(h.Child("uid").Value.ToString(), h.Child("name").Value.ToString(), h.Child("photo").Value.ToString(),int.Parse(h.Child("score").Value.ToString()));
                    leaderBoard.Add(userScore);
                }
            }
        });

推荐答案

如何知道我的排名

how to know my rank

这取决于谁是我的".但是，请说您在变量uid中具有当前用户的UID.然后，您可以通过以下方法确定他们在前10名中的排名:

That depends a bit on who "my" is. But say you have the UID of the current user in a variable uid. You can then determine their rank in this top 10 with:

int rank = 0;
foreach (DataSnapshot h in snapshot.Children)
{
    rank = rank + 1;
    UserScore userScore = new UserScore(
      h.Child("uid").Value.ToString(), 
      h.Child("name").Value.ToString(), 
      h.Child("photo").Value.ToString(),
      int.Parse(h.Child("score").Value.ToString()));
    leaderBoard.Add(userScore);
    if (h.Child("uid").Value.ToString() == uid) {
      Debug.Log("I'm number "+rank+" in the rankings");
    }
}

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