Why can't I select TableView cells?

I have just used your code to create a simple table, selection is working fine and logging out HELLO as expected. Can you check the values of Selection in the attributes inspector? Here is mine, which has Selection set to Single Selection.

And here is the code I used for my simple table

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var tableView: UITableView!

    var searchResults = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        searchResults.append("Testing 1")
        searchResults.append("Testing 2")
        searchResults.append("Testing 3")
        searchResults.append("Testing 4")
        searchResults.append("Testing 5")

        tableView.dataSource = self
        tableView.delegate = self
    }

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

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCellWithIdentifier("tableCell", forIndexPath: indexPath)
        cell.textLabel?.text = searchResults[indexPath.row]

        return cell
    }

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

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        print("HELLO")
    }
}

I also tried hiding and showing the tableView which made no difference on selection.

EDIT & SOLUTION:

In the comments below, we discovered that the issue is related to a tapGestureRecogniser on the view, This was identified by the op only being able to make a selection by holding a tap on the cell. The gesture has to fail before the selection can be made, the op managed to solve the problem by referring to this other SO Answer

if you use "tap" gesture, you can't select table cell. (but, if you click and drag to right a cell, you can select it.)

Check gesture first.

And if your code has self.tableView.allowsSelection = false, replace false to true or delete this line.

My problem has been caused by the tap gesture recognizer on the view controller itself (I had BaseTableViewController I was extending from). Probably it was interfering with the gesture recognizers of UITableView.