gistfile1.txt

    override func viewDidLoad() {
        super.viewDidLoad()

        _ = Timer.scheduledTimer(timeInterval: 1.5, target: self, selector: #selector(AddLocationViewController.updateSearchText), userInfo: nil, repeats: true)
    }
    
    func updateSearchText() {
    if previousSearchText != searchTextField.text {
        previousSearchText = searchTextField.text!
        tableDataSource.sourceTextHasChanged(searchTextField.text)
    }