从Firebase在Tableview中快速显示数据

Question

Im trying to retrieve data from firebase and store it into array and show it in tableView but after running the code the tableView does not show anything so whats the problem do i missed something ,somehow my tableView reloadData dose not work and my Array seem have values in method but outside the method the array is empty , I'm using Swift 4 .

 import UIKit
 import  Firebase
 import  ProgressHUD
class HistoryTableViewController: UITableViewController  {

var keys = ""
var arrayHistory : [String] =  []

@IBOutlet var hist: UITableView!


func RET  (){
    print("!!!!!!!!!!!!!!!!!!!!!")
   let messageDB = Database.database().reference().child("history")


    messageDB.observe(.childAdded) { (snapshot) in
        print("xxxxxxxxxxxxxxxxxxxxxxxxxxxx")

        let h = snapshot.value as! String

        self.arrayHistory.append(h)

        print(h)

        self.tableView.reloadData()

         ProgressHUD.dismiss()
    }

}

override func viewDidLoad() {

    super.viewDidLoad()

    ProgressHUD.show()

    RET()

    print(" basimmmmmmmmmmm")

}

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 0
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return arrayHistory.count
}

 override func tableView(_ tableView: UITableView, cellForRowAt 
   indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)

    // Configure the cell...


   print ("hlooooooooooooooooo")

   cell.textLabel!.text = arrayHistory[indexPath.row]

    return cell
}
}

Answer 1

You have two options, you delete this method:

override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
    return 0
}

OR you modify it to return your desired sections number:

override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
    return yourCount // whatever section count you want
}

If you only delete it it will return automatically 1 for number of sections in table view.