TableView won't show at runtime.

var cities: [City]?

override func awakeFromNib() {
    super.awakeFromNib()
}

override func viewDidLoad() {
    super.viewDidLoad()
    if cities?.count > 0 {
        return
    }
    let london = City(name: "London", coordinates: (51.50722, -0.12750))
    let melbourne = City(name: "Melbourne", coordinates: (-37.8136, 144.9631))
    let singapore = City(name: "Singapore", coordinates: (-23.5475000,-46.6361100))
    let saopaulo = City(name: "Sao Paulo", coordinates: (49.3297,8.57428))
    let nurbergring = City(name: "Nurbergring", coordinates: (45.58005,9.27246))

    cities?.append(london)
    cities?.append(melbourne)
    cities?.append(singapore)
    cities?.append(saopaulo)
    cities?.append(nurbergring)


     tableView.reloadData()
    // Do any additional setup after loading the view, typically from a nib.

}

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


// MARK: - Segues

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetail" {
        if let indexPath = self.tableView.indexPathForSelectedRow() {

            let selectedCity = cities?[indexPath.row]

            (segue.destinationViewController as! ViewController).city = selectedCity
        }
    }
}

// MARK: - Table View

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return cities?.count ?? 0
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell

    let city = cities?[indexPath.row]
    cell.textLabel!.text = city!.name
    return cell
}

override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return false if you do not want the specified item to be editable.
    return true
}