Cacher is the code snippet organizer for pro developers

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:",
            name: UIKeyboardDidShowNotification, object: nil)
        
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden:",
            name: UIKeyboardWillHideNotification, object: nil)
   

 func keyboardWasShown (notification: NSNotification) {
        
        let info = notification.userInfo!
        let keyboardSize = (info[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue()
        
        let insets = UIEdgeInsetsMake(0, 0, keyboardSize!.height, 0)
        mainView.contentInset = insets
        mainView.scrollIndicatorInsets = insets
        
        var aRect = view.frame
        aRect.size.height -= keyboardSize!.height
        
        if let activeField = activeField {
            if !CGRectContainsPoint(aRect, activeField.superview!.frame.origin) {
                mainView.scrollRectToVisible(activeField.frame, animated: true)
            }
        }
        
    }
    
    func keyboardWillBeHidden (notification: NSNotification) {
        
        let insets = UIEdgeInsetsZero
        
        mainView.contentInset = insets
        mainView.scrollIndicatorInsets = insets
        
    }