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override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        
        let notificationCenter = NSNotificationCenter.defaultCenter()
        notificationCenter.addObserver(self, selector: #selector(ParentalConrolViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
        notificationCenter.addObserver(self, selector: #selector(ParentalConrolViewController.keyboardWillHide(_:)), name: UIKeyboardWillHideNotification, object: nil)
    }
    
    override func viewDidDisappear(animated: Bool) {
        super.viewDidDisappear(animated)
        
        let notificationCenter = NSNotificationCenter.defaultCenter()
        notificationCenter.removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
        notificationCenter.removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
    }
    
    func keyboardWillShow(notification: NSNotification) {
       
        let userInfo = notification.userInfo!
        let keyboardHeight = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue().height
        
        UIView.transitionWithView(self.view, duration:0.3,
            options: UIViewAnimationOptions.CurveEaseInOut,
            animations: {
                self.view.frame.origin.y = -yShift
            }, completion: nil)

    }
    
    func keyboardWillHide(notification: NSNotification) {
        
        UIView.transitionWithView(self.view, duration: 0.325, options: UIViewAnimationOptions.CurveEaseInOut, animations: {
                self.view.frame.origin.y = 0
            }, completion: nil)
    }