override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return chapters.count
    }


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "reuse", for: indexPath)

        return chapters[indexPath.row].asTableCell(cell)
    }

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

    /*
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            _ = chapters.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
        } else if editingStyle == .insert {
            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
        }
    }*/

    override func tableView(_ tableView: UITableView, performAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) {

    }

    override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {

        let delete = UITableViewRowAction(style: .destructive, title: "Delete") { (action, indexPath) in
            // delete item at indexPath
            self.chapters.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
        }

        let share = UITableViewRowAction(style: .normal, title: "Share") { (action, indexPath) in
            // share item at indexPath
            print("I want to share: \(self.chapters[indexPath.row].title)")
        }

        share.backgroundColor = UIColor.lightGray
        share.backgroundEffect = UIVisualEffect()
        return [delete, share]

    }