arrays - 将 Firebase 数据附加到 Swift ios 中的数组

Question

我不知道我做错了什么!我只是想从 F​​irebase 数据库中获取数据并迭代每个结果并将它们放入数组中。我尝试了多种不同的方法。但它们都返回结果，一次向数组添加一个。我有如下数据:

    {
      "1400001" : {
        "HHtype" : 3,
        "Sesgrup" : 4,
        "lg_Et harcaması" : 0,
        "lg_Total Harcama" : 3.11
      },
      "1400002" : {
        "HHtype" : 1,
        "Sesgrup" : 4,
        "lg_Et harcaması" : 1.2,
        "lg_Total Harcama" : 3.15
      },
      "1400004" : {
        "HHtype" : 3,
        "Sesgrup" : 4,
        "lg_Et harcaması" : 1.18,
        "lg_Total Harcama" : 3.06
      },
      "1400005" : {
        "HHtype" : 4,
        "Sesgrup" : 3,
        "lg_Et harcaması" : 2.21,
        "lg_Total Harcama" : 3.74
      },
      ....... 

而且，我正在使用下面的代码:

func sen(){
        var rootRef: FIRDatabaseReference!
        var refHandle: UInt!
        var haneRef: FIRDatabaseReference!
        var numbersArray = [Int] ()



        rootRef = FIRDatabase.database().reference()
        haneRef = rootRef.child("SES2014")


        haneRef.queryOrderedByChild("lg_Et harcaması").queryLimitedToLast(4).observeEventType(.ChildAdded, withBlock: { (snapshot) in
            let hhtype = snapshot.value!["HHtype"] as? Int
            numbersArray.append(hhtype!)
            print(numbersArray)



        })

    }

并且，结果是:

[3]
[3, 1]
[3, 1, 4]
[3, 1, 4, 4]

我只想得到最后一个数组:[3, 1, 4, 4]

我该怎么做？谢谢

Answer 1

func sen(){
        var rootRef: FIRDatabaseReference!
        var refHandle: UInt!
        var haneRef: FIRDatabaseReference!
        var numbersArray = [Int] ()



        rootRef = FIRDatabase.database().reference()
        haneRef = rootRef.child("SES2014")

        let queryCount = 4
        haneRef.queryOrderedByChild("lg_Et harcaması").queryLimitedToLast(queryCount).observeEventType(.ChildAdded, withBlock: { (snapshot) in
            let hhtype = snapshot.value!["HHtype"] as? Int
            numbersArray.append(hhtype!)
            queryCount -= 1
            if queryCount <= 0 {
                print(numbersArray)
            }



        })

    }