Add auto complete to UITextField inside UITableViewCell in Swift - swift

Question

I followed the suggestion here
https://stackoverflow.com/a/32948918/5447089
But it seems to work when a Text Field is inside UIViewController. In my case the TF is inside UITableViewCell and table with suggestions doesn't appear when there is some data for auto completion.
Also cellForRowAtIndexPath is not called. Other delegate methods such as numberOfRowsInSection work normally.
What can be the reason for this?
import UIKit
import CoreData
class AddElemTableViewCell: UITableViewCell, UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var myTextField: UITextField!
var autocompleteTableView = UITableView(frame: CGRectMake(0,80,320,120), style: UITableViewStyle.Plain)
var elements = [“Beer”, “Bear”, “Park”, “Pad”]
var autocompleteElements = [String]()
var currentElem: Elem!
override func awakeFromNib() {
super.awakeFromNib()
myTextField.delegate = self
autocompleteTableView.delegate = self
autocompleteTableView.dataSource = self
autocompleteTableView.scrollEnabled = true
autocompleteTableView.hidden = true
myTextField.addTarget(self, action: #selector(AddElemTableViewCell.didChangeText(_:)), forControlEvents: .EditingChanged)
}
func didChangeText(textField:UITextField) {
autocompleteTableView.hidden = false
let substring = (myTextField.text! as NSString)
searchAutocompleteEntriesWithSubstring(substring as String)
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func searchAutocompleteEntriesWithSubstring(substring: String)
{
autocompleteElements.removeAll(keepCapacity: false)
for curString in elements
{
let myString:NSString! = curString as NSString
let substringRange :NSRange! = myString.rangeOfString(substring,options: [.CaseInsensitiveSearch])
if (substringRange.location == 0)
{
autocompleteElements.append(curString)
}
}
autocompleteTableView.reloadData()
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
if textField == myTextField {
if (textField.text!.characters.count > 0) {
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedObjectContext = appDelegate.managedObjectContext
let entityElement = NSEntityDescription.entityForName("element", inManagedObjectContext: managedObjectContext)
let element = element(entity: entityElement!, insertIntoManagedObjectContext: managedObjectContext)
element.name = textField.text!
do {
try managedObjectContext.save()
} catch {
let saveError = error as NSError
print(saveError)
}
textField.text! = ""
textField.placeholder = “add new element”
self.endEditing(true)
}
}
return true
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return autocompleteElements.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let autoCompleteRowIdentifier = "AutoCompleteRowIdentifier"
let cell = UITableViewCell(style: UITableViewCellStyle.Default , reuseIdentifier: autoCompleteRowIdentifier)
let index = indexPath.row as Int
cell.textLabel!.text = autocompleteElements[index]
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let selectedCell : UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
myTextField.text = selectedCell.textLabel!.text
}
}