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class DataSource: NSObject, UITableViewDataSource {
    private var document = Document.sharedInstance
    func addItemTo(tableView: UITableView) {
        if document.numberOfCards < 5 {
            document.addNewCard(at: 0)
            insertTopRowIn(tableView: tableView)
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return document.numberOfCards
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CardCell
        let card = document.getCard(at: indexPath.row)
        cell.fillWith(card: card)
        return cell
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            document.deleteCard(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.
    func insertTopRowIn(tableView: UITableView) {
        let indexPath = IndexPath(row: 0, section: 0)
        tableView.insertRows(at: [indexPath], with: .fade)
    func deleteRowAtIndexPath(indexPath: NSIndexPath, from tableView: UITableView) {
class MasterViewController: UITableViewController {
    private var dataSource = DataSource()
    var detailViewController: DetailViewController? = nil
    override func viewDidLoad() {
        // Do any additional setup after loading the view, typically from a nib.
        tableView.dataSource = dataSource
        self.navigationItem.leftBarButtonItem = self.editButtonItem
        let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(MasterViewController.addNewCard(sender:)))
        self.navigationItem.rightBarButtonItem = addButton
        if let split = self.splitViewController {
            let controllers = split.viewControllers
            self.detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
    override func viewWillAppear(_ animated: Bool) {
        self.clearsSelectionOnViewWillAppear = self.splitViewController!.isCollapsed
    override func didReceiveMemoryWarning() {
        // Dispose of any resources that can be recreated.
    @IBAction private func addNewCard(sender: UIBarButtonItem) {
        dataSource.addItemTo(tableView: tableView)
    // MARK: - Segues
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showDetail" {
            if let indexPath = self.tableView.indexPathForSelectedRow {
                let card = Document.sharedInstance.getCard(at: indexPath.row)
                let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
                controller.detailItem = card
                controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem
                controller.navigationItem.leftItemsSupplementBackButton = true
    // MARK: - Table View
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true


https://github.com/murakami/workbook/tree/master/ios/Hand - GitHub




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Help us understand the problem. What are the problem?