editButtonItem Does Not Work

Question

I have a table view inside a UIViewController with editing enabled for deleting rows. Swiping from the right lets me delete rows and I have the edit button on the navigation bar but it doesn't actually do anything except switch from saying Edit to Done.

Here is how I'm creating my table view.

override func viewWillAppear(animated: Bool) {
    for view in self.view.subviews {
        view.removeFromSuperview()
    }

    if sharedCart.shoppingCart.isEmpty {
        self.navigationItem.rightBarButtonItem = nil

        isEmptyLabel = UILabel(frame: CGRectMake(self.view.frame.width / 2, self.view.frame.height / 2, self.view.frame.width, self.view.frame.height))
        isEmptyLabel.center = self.view.center
        isEmptyLabel.text = "Your cart is empty."
        isEmptyLabel.textAlignment = .Center
        isEmptyLabel.textColor = UIColor.whiteColor()
        isEmptyLabel.font = UIFont(name: "Helvetica-Light", size: 20.0)

        self.view.addSubview(isEmptyLabel)
    } else {
        isEmptyLabel.removeFromSuperview()
        total = 0

        let editItem = self.editButtonItem()
        self.navigationItem.rightBarButtonItem = editItem

        tableView = UITableView(frame: self.view.frame, style: .Grouped)
        tableView.delegate = self
        tableView.dataSource = self
        tableView.backgroundColor = UIColor.clearColor()
        tableView.contentInset = UIEdgeInsetsMake(44, 0, 0, 0)

        tableView.registerNib(UINib(nibName: "CartCell", bundle: nil), forCellReuseIdentifier: "passCartCell")
        tableView.registerNib(UINib(nibName: "CartFooterView", bundle: nil), forHeaderFooterViewReuseIdentifier: "cartFooter")

        self.view.addSubview(tableView)
}

And I use these methods for editing.

func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if editingStyle == .Delete {
        sharedCart.shoppingCart.removeAtIndex(indexPath.row)

        self.viewWillAppear(true)
    }
}

Answer 1

Cedric Michael's answer almost works, but it disables editButtonItem's automatic, animated toggling between the Edit and Done title & associated state. The better fix is this:

override func setEditing(_ editing: Bool, animated: Bool) {
    super.setEditing(editing, animated: animated)
    tableView.setEditing(editing, animated: animated)
}

Also, if you want to hide the Edit button for an empty shopping cart, it would be better form to set navigationItem.rightBarButtonItem = editButtonItem in viewDidLoad() and simply set navigationItem.rightBarButtonItem.isHidden to true or false in viewWillAppear() according to the shopping cart.