Show keyboard with scrollview

keyboard.swift

// properti
    var tapper:UIGestureRecognizer!
    
// hide keyboard with tap
    self.tapper = UITapGestureRecognizer(target: self, action: "handleSingleTapToHideKeyboard:")
    self.view.addGestureRecognizer(self.tapper)
        
    func handleSingleTapToHideKeyboard(sender:UITapGestureRecognizer) {
        self.view.endEditing(true)
    }        
    
// MARK:- Keyboard
    
    override func viewWillAppear(animated: Bool) {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
    }
    
    override func viewWillDisappear(animated: Bool) {
        NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
    }
    
    func keyboardWillShow(notification: NSNotification) {
        let userInfo: NSDictionary = notification.userInfo!
        let keyboardSize = userInfo.objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue.size
        let contentInsets = UIEdgeInsetsMake(0, 0, keyboardSize.height-30, 0)
        self.scrollView.contentInset = contentInsets
        self.scrollView.scrollIndicatorInsets = contentInsets
        
        var viewRect = view.frame
        viewRect.size.height -= keyboardSize.height
        if CGRectContainsPoint(viewRect, self.userDniView.frame.origin) {
            let scrollPoint = CGPointMake(0, self.userDniView.frame.origin.y - keyboardSize.height)
            self.scrollView.setContentOffset(scrollPoint, animated: true)
        }
    }
    
    func keyboardWillHide(notification: NSNotification) {
        self.scrollView.contentInset = UIEdgeInsetsZero
        self.scrollView.scrollIndicatorInsets = UIEdgeInsetsZero
    }