     }
     
     // MARK: Keyboard
+    
     func addDoneButtonToKeyboard() {
         let numberToolbar = UIToolbar(frame: CGRectMake(0, 0, self.view.frame.size.width, 50))
         numberToolbar.barStyle = UIBarStyle.Default

    
    @IBOutlet weak var tipPercentSlider: UISlider!
    
    // MARK: Init
    override func viewDidLoad() {
        super.viewDidLoad()
        


    
    // MARK: Helpers
    
    func updateTipPersentLabel() {
        let percentValue = Int(tipPercentSlider.value)
        tipPercentLabel.text = "Tip (\(percentValue)%)"
