TableView不打印任何单元格（swift）

我正在尝试将从firebase数据库提取的简单值显示到当前的TableView中。我遇到的问题是，这些单元格当前没有填充任何内容。我加入print语句只是为了确保数组不是空的，它不是空的。我正在使用以下代码：

    class DisplayTransactions: UITableViewController {

    var ref = FIRDatabase.database().reference()

    //gets current firebase users
    var userC = FIRAuth.auth()?.currentUser
    var pubCount: Int!
    var anArray = [String] ()

    override func viewDidLoad() {
        super.viewDidLoad()
        var transRef = FIRDatabase.database().reference().child("Users").child((userC?.uid)!).child("PaymentTransactions")

        //for Deposit children
        transRef.child("Deposit").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
            //creates enumerator of the snapshot children for
            let enumerator = snapshot.children
            while let rest = enumerator.nextObject() as? FIRDataSnapshot {
                self.anArray.append(String(rest.value))

                //printing the rest.value to make sure there are children to iterate through
                print(rest.value)
            }
        })
        //for Withdrawl children
        transRef.child("Withdraw").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
            //creates enumerator of the snapshot children for
            let enumerator = snapshot.children
            while let rest = enumerator.nextObject() as? FIRDataSnapshot {
                self.anArray.append(String(rest.value))

                //printing the rest.value to make sure there are children to iterate through
                print(rest.value)
            }
        })
        print(anArray)
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return anArray.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .Subtitle, reuseIdentifier: "cellID")

        cell.textLabel?.text = anArray[indexPath.row]
        print(anArray[indexPath.row])

        return cell
    }
}

---

在填充数据源后，似乎没有重新加载UITableView。 每次更改数组的内容时，都需要这样做

override func viewDidLoad() {
    super.viewDidLoad()
    var transRef = FIRDatabase.database().reference().child("Users").child((userC?.uid)!).child("PaymentTransactions")

    //for Deposit children
    transRef.child("Deposit").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
        //creates enumerator of the snapshot children for
        let enumerator = snapshot.children
        while let rest = enumerator.nextObject() as? FIRDataSnapshot {
            self.anArray.append(String(rest.value))

            //printing the rest.value to make sure there are children to iterate through
            print(rest.value)
        }
        self.tableView.reloadData() //<<<<<<<<<<<< RELOAD TABLEVIEW
    })
    //for Withdrawl children
    transRef.child("Withdraw").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
        //creates enumerator of the snapshot children for
        let enumerator = snapshot.children
        while let rest = enumerator.nextObject() as? FIRDataSnapshot {
            self.anArray.append(String(rest.value))

            //printing the rest.value to make sure there are children to iterate through
            print(rest.value)
        }
        self.tableView.reloadData() //<<<<<<<<<<<< RELOAD TABLEVIEW
    })
    print(anArray)
}

override func viewDidLoad（）{
super.viewDidLoad（）
var transRef=FIRDatabase.database（）.reference（）.child（“用户”）.child（（userC？.uid）！）.child（“付款交易”）
//寄存儿童
transRef.child（“存款”）.observeSingleEventOfType（.Value，带块：{（快照）in
//为创建快照子项的枚举数
让枚举数=snapshot.children
而让rest=enumerator.nextObject（）作为？FIRDataSnapshot{
self.anArray.append（字符串（rest.value））
//打印rest.value以确保有子级要迭代
打印（剩余值）
}
self.tableView.reloadData（）//我已经尝试过了，但是没有任何变化。仍然会显示一小段空白单元格，然后转到一个完全空白的页面。啊，我的错误，我把.reloadData（）原来放错了位置。你需要将这些放在“块”内，而不是外部。