Question

我对Append Firebase data to an array in Swift ios有疑问。当我使用queryEqualToValue对超链接中给出的数据运行此代码时，它会给出queryCount具有的元素数。但是，我希望将所有元素转换为数组。

例如，当我运行kısıt(3)时，我希望在HHtype的情况下获得所有Sesgrup = 3值。并且，将这些元素存储在一个数组中。你能帮我解决这个问题吗？

我有以下数据：

{
  "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
  },
  ....... (9000unit)

最后答案的代码：

func kısıt(sesNotoSet: UInt){

    var rootRef: FIRDatabaseReference!
    var haneRef: FIRDatabaseReference!
    var numbersArray = [Int] ()

    self.sesNo = sesNotoSet



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

    var queryCount : UInt = sesNotoSet
    haneRef.queryOrderedByChild("Sesgrup").queryEqualToValue(queryCount).observeEventType(.ChildAdded, withBlock: { (snapshot) in
        print(snapshot)

        if let HHtypeDict = snapshot.value! as? [String:AnyObject]{
            for each in HHtypeDict{
                numbersArray.append(each.1["HHtype"] as! Int)
            }

            queryCount -= 1
            if queryCount <= 0 {
                print(numbersArray)
            }


        }

    })



}

给定的错误：fatal error: unexpectedly found nil while unwrapping an Optional value和print(snapshot)仅为：

Snap (1400005) {
    HHtype = 4;
    Sesgrup = 3;
    "lg_Et harcamas\U0131" = "2.21";
    "lg_Total Harcama" = "3.74";
}

但是，快照应该有425个元素

Answer 1

试试这个： -

  func kısıt(sesNotoSet: UInt){

    var rootRef: FIRDatabaseReference!
    var haneRef: FIRDatabaseReference!
    var numbersArray = [Int] ()

    self.sesNo = sesNotoSet



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

    var queryCount : UInt = sesNotoSet
    haneRef.queryOrderedByChild("Sesgrup").queryEqualToValue(queryCount).observeEventType(.ChildAdded, withBlock: { (snapshot) in


        if let HHtypeDict = snapshot.value! as? [String:AnyObject]{
           for each in HHtypeDict{
           numbersArray.append(each.1["HHtype"] as! Int)
              }

        queryCount -= 1
        if queryCount <= 0 {
            print(numbersArray)
        }

      }

    })



}

使用Swift中的queryEqualToValue将Firebase数据附加到数组

1 个答案: