如何读取Firebase快照并将特定的键值对存储在通用数组中？

Question

如何提取找到的每个快照结果的URL并将其附加到Swift中的数组？

Snap (palettes) {
    "-KSoMzY6OYPyXnOPeZMb" =     {
        0 = "#000000";
        1 = "#423831";
        2 = "#2C2923";
        3 = "#424131";
        4 = "#35382A";
        URL = test;
    };
    "-KSoN-LT8I--3m-BBbfw" =     {
        0 = "#000000";
        1 = "#F6DBC5";
        2 = "#E0D6BE";
        3 = "#F6F6C5";
        4 = "#E1ECBD";
        URL = test2;
    };

这是调用后返回的JSON结构的示例：

databaseRef.child("palettes").queryOrdered(byChild: "0").queryEqual(toValue: text).observeSingleEvent(of: .value, with: { (snapshot) in
            print (snapshot)
    })

如何提取多重结果快照的URL，然后将其附加到Swift中的数组中，以便最终结果变为array = [test, test2] ？

谢谢。

编辑

这是我的JSON树：

{
  "palettes" : {
    "-KSoMzY6OYPyXnOPeZMb" : {
      "0" : "#000000",
      "1" : "#423831",
      "2" : "#2C2923",
      "3" : "#424131",
      "4" : "#35382A",
      "URL" : "test"
    },
    "-KSoN-LT8I--3m-BBbfw" : {
      "0" : "#000000",
      "1" : "#F6DBC5",
      "2" : "#E0D6BE",
      "3" : "#F6F6C5",
      "4" : "#E1ECBD",
      "URL" : "test2"
    },
    "-KSoN-e0huiOxyj0jadl" : {
      "0" : "#F1CBC1",
      "1" : "#FBE1C9",
      "2" : "#E5DCC2",
      "3" : "#FBFBC9",
      "4" : "#000000",
      "URL" : "test3"
    },
    "-KSqFcPjjtRkRDbzH-lc" : {
      "0" : "#27643A",
      "1" : "#2B6E52",
      "2" : "#000000",
      "3" : "#2B676E",
      "4" : "#274E64",
      "URL" : "test4"
    }
  }
}

Answer 1

尝试这个：-

var arrayVar = [String]()

FIRDatabase.database().reference().child("palletes").observeSingleEvent(of: .value, with: {(snap) in

        if let snapDict = snap.value as? [String:AnyObject]{

            for each in snapDict as [String:AnyObject]{

                let _URL = each.value["URL"] as! String
                arrayVar.append(_URL)

            }
        }
    })