Dúvida no Ex. 6 da Aula 5 - Mellhorando o código, usando e recebendo closures

Meu código não funciona, não consigo identificar o por que. Alguém tem alguma ideia?

 func showDetails(recognizer: UILongPressGestureRecognizer){
        if recognizer.state == UIGestureRecognizerState.Began {
            let cell = recognizer.view as! UITableViewCell
            let indexPath = tableView.indexPathForCell(cell)
            if indexPath == nil {
                return
            }
            let row = indexPath!.row
            let meal = meals[ row ]
            RemoveViewController(controller: self).show(meal, handler: { action in
                self.meals.removeAtIndex(row)
                self.tableView.reloadData()
            })
        }
    }

e

class RemoveViewController{
    let controller: UIViewController
    init(controller: UIViewController){
        self.controller = controller
    }
    func show(meal:Meal, handler:((UIAlertAction!) -> Void  )){
        let details = UIAlertController(title: meal.name,
                                        message: meal.details(),
                                        preferredStyle: UIAlertControllerStyle.Alert)
        let remove = UIAlertAction(title: "Remove",
                                   style: UIAlertActionStyle.Destructive,
                                   handler: handler)
        details.addAction(remove)
        let cancel = UIAlertAction(title: "Cancel",
                                   style: UIAlertActionStyle.Default,
                                   handler: nil)
        details.addAction(cancel)

    }
}