using-closure.swift

class LetItGoTableViewController: UITableViewController {
    
    private enum SignInField: Int {
        case Username
        case Password
        case RememberMe
        case SignInButton
    }
    
    // MARK: - Table view data source
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 4
    }
    
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let identifier: String = {
            guard let type = SignInField(rawValue: indexPath.row) else { return "defaultCell" }
            switch type {
            case .Username: return "textFieldCell"
            case .Password: return "secureTextFieldCell"
            case .RememberMe: return "switchWithTextCell"
            case .SignInButton: return "buttonCell"
            }
        }()
        
        let cell = tableView.dequeueReusableCellWithIdentifier(identifier, forIndexPath: indexPath)
        // cell configuration goes here
        return cell
    }
}