populate UITableView with data stored in Firebase database - swift

Question

I have a UITableVIew in my iPhone application that populates each cell using an array but the question is how do you populate the array with values retrieved from the firebase database:
func retData(){
rootRef.child("users").child("Test").observeEventType(.Value){
(snap: FIRDataSnapshot) in
}
}
var no1 = ["3","6","3","4","5","20","34","34"]
Table Code:
func tableView(tableView: UITableView, cellForRowAtIndexPath
indexPath: NSIndexPath) -> UITableViewCell {
let cell1 = self.h_table.dequeueReusableCellWithIdentifier("cell1",
forIndexPath: indexPath) as! Hole_Cell
cell1.s_label.text = usersArray[indexPath.row]
firebase data Structure:
--Users
--Test: 1
--Test1: 2
--Test2: 3
--Test4: 4

Answer 1

Try this:
var usersArray: [String]?
func retData() {
rootRef.child("users").observeEventType(.Value, withBlock: { snapshot in
usersArray = [String]()
for user in snapshot.allObjects as! [FIRDataSnapshot] {
let userString = user.value as? String
usersArray?.append(userString!)
}
})
}
***Edit Try this:
var usersArray = [String]()
func retData() {
rootRef.child("users").observeEventType(.Value, withBlock: { snapshot in
let usersDict = snapshot.value as! [String:String]
self.usersArray= Array(usersDict.values)
self.tableView.reloadData()
}
})
}
*** Again Edit: Add this within the closure to account for when users has no data.
if let _ = snapshot.value as? NSNull {
return
} else {
let usersDict = snapshot.value as! [String:String]
self.usersArray= Array(usersDict.values)
self.tableView.reloadData()
}

Answer 2

Check my latest Questions, basically the same stuff. Checkout Firebase UI, very useful.
I used a ViewController with a table view and a Prototype Cell in it. Then this worked for me:
import Firebase
import FirebaseDatabaseUI
class LinksViewController: UIViewController, UITableViewDelegate {
var dataSource: FirebaseTableViewDataSource?
var ref = FIRDatabase.database().reference()
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
dataSource = FirebaseTableViewDataSource.init(query: myQuery(),prototypeReuseIdentifier: "<Your-Identifier>", view: self.tableView)
dataSource?.populateCellWithBlock { (cell: UITableViewCell, obj: NSObject) -> Void in
//Populate your Cell here
}
tableView.dataSource = dataSource
tableView.delegate = self
}
}
Note that the myQuery is basically then your first line.