class ListCommentsCells: UITableViewCell {


    @IBOutlet weak var tableView: UITableView!
    var comments: [Comment]? {
        didSet {
            println("WHEN SETTING COUNT HERE \(comments?.count)")
            tableView.reloadData()
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        tableView.delegate = self
        tableView.dataSource = self
    }

}

extension ListCommentsCells: UITableViewDelegate, UITableViewDataSource {
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        println("COUNT CELLFORITEM \(comments?.count)")
        let cell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
        let comment = comments?[indexPath.row]
        cell.textLabel?.text = comment?.content
        return cell
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if let count = comments?.count {
            println("COUNT NUMBEROFROWSINSECTION \(count)")
            return count
        }
        return 0
    }
}


OUTPUT when setting comments:

WHEN SETTING COUNT HERE Optional(1)
COUNT NUMBEROFROWSINSECTION 1