Question

我正在尝试从Firebase中提取排行榜数据。当我查看＆＃34;快照＆＃34;我能够以正确的顺序获取数据。数据。一旦我使用var json = JSON（snapshot.value）到达该行，数据将失去其顺序。

我正在尝试将数据解析为swift obects，以便它们可以在我的swift应用程序中作为有序排行榜使用/显示。我可以找到一种解决方法，让我的数据很容易出错，但它困扰我。

func getScoresData() {
    let scoresRef = ref.childByAppendingPath("/High Scores")

    scoresRef.queryLimitedToFirst(10).observeSingleEventOfType(.Value, withBlock: { snapshot in
        print(snapshot)
        var json = JSON(snapshot.value)
        print(json)

        let theKeys = json.dictionary!.keys

        for key in theKeys {

            self.timeStampArray.append(key)

            let tempName = json[key]["Name"]
            self.namesArray.append(String(tempName))

            let tempScore = json[key]["Score"]
            self.scoresArray.append(String(tempScore))
        }
    })
}

这是我从打印（快照）中正确排序的输出：

Snap (High Scores) {
    "-KC3MktE1jS5z9-tTEgJ" =     {
        ".priority" = "-9";
        Date = "1457140993.669797";
        Name = brendan;
        Score = 9;
        UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
    };
"-KC3MktM-rWmoitem8na" =     {
    ".priority" = "-9";
    Date = "1457140993.677347";
    Name = brendan;
    Score = 9;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3MktW0iJfkAKjlCy4" =     {
    ".priority" = "-9";
    Date = "1457140993.686348";
    Name = brendan;
    Score = 9;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3MktapH6Mebw2sAUe" =     {
    ".priority" = "-10";
    Date = "1457140993.692581";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3MktbOyltGaJZ_XtD" =     {
    ".priority" = "-10";
    Date = "1457140993.694163";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3MktjFj6VVAJfitZp" =     {
    ".priority" = "-10";
    Date = "1457140993.701368";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3Mktk0_f6_eM8wP1x" =     {
    ".priority" = "-10";
    Date = "1457140993.702492";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3MktrZaStt9b5pID_" =     {
    ".priority" = "-10";
    Date = "1457140993.709843";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3QALPl38gbDy4xLE2" =     {
    ".priority" = "-10";
    Date = "1457141888.477473";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};
"-KC3qGAqZiJ9Vs40MwG7" =     {
    ".priority" = "-10";
    Date = "1457148990.24583";
    Name = brendan;
    Score = 10;
    UUID = "BD561F1C-72A8-4A01-A71A-850682E49D61";
};

}

这是来自print（json）行的不正确排序的数据：

{
  "-KC3MktrZaStt9b5pID_" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.709843,
    "Name" : "brendan"
  },
  "-KC3QALPl38gbDy4xLE2" : {
    "Score" : 10,
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457141888.477473,
"Name" : "brendan"
  },
  "-KC3MktW0iJfkAKjlCy4" : {
    "Score" : "9",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.686348,
    "Name" : "brendan"
  },
  "-KC3MktbOyltGaJZ_XtD" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.694163,
    "Name" : "brendan"
  },
  "-KC3Mktk0_f6_eM8wP1x" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.702492,
    "Name" : "brendan"
  },
  "-KC3MktM-rWmoitem8na" : {
    "Score" : "9",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.677347,
    "Name" : "brendan"
  },
  "-KC3MktapH6Mebw2sAUe" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.692581,
    "Name" : "brendan"
  },
  "-KC3qGAqZiJ9Vs40MwG7" : {
    "Score" : 10,
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457148990.24583,
    "Name" : "brendan"
  },
  "-KC3MktjFj6VVAJfitZp" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.701368,
    "Name" : "brendan"
  },
  "-KC3MktE1jS5z9-tTEgJ" : {
    "Score" : "9",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.669797,
    "Name" : "brendan"
  }
}

由于我使用json对象获取密钥，从而填充数组，因此数组中的数据乱序。

我错过了什么？

Answer 1

如果要维护排序，请使用数组而不是字典，无论是JSON还是Swift对象。因此，为了维护排序，您可以从此更改JSON结构：

{
  "-KC3MktrZaStt9b5pID_" : {
    "Score" : "10",
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457140993.709843,
    "Name" : "brendan"
  },
  "-KC3QALPl38gbDy4xLE2" : {
    "Score" : 10,
    "UUID" : "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date" : 1457141888.477473,
    "Name" : "brendan"
  }
}

到此：

[
  {
    "Key": "-KC3MktrZaStt9b5pID_",
    "Score": "10",
    "UUID": "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date": 1457140993.709843,
    "Name": "brendan"
  },
  {
    "Key": "-KC3QALPl38gbDy4xLE2",
    "Score": 10,
    "UUID": "BD561F1C-72A8-4A01-A71A-850682E49D61",
    "Date": 1457141888.477473,
    "Name": "brendan"
  }
]

使用swiftyJSON / swift从Firebase解析排行榜数据

1 个答案: