ScrollView unhide content with keyboard

scrollview_keyboard.swift

    @IBOutlet weak var scrollView: UIScrollView!
    
    func registerForKeyboardNotifications() {
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(_:)), name: .UIKeyboardDidShow, object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(_:)), name: .UIKeyboardWillHide, object: nil)
    }
    
    @IBAction func keyboardWasShown(_ notification: NSNotification) {
        guard let userInfo = notification.userInfo,
            let keyboardFrameValue = userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue
            else {return }
        
        let keyboardHeight = keyboardFrameValue.cgRectValue.size.height
        let contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardHeight+50, 0.0)
        
        scrollView.contentInset = contentInsets
        scrollView.scrollIndicatorInsets = contentInsets
    }
    
    @IBAction func keyboardWillBeHidden(_ notification: NSNotification) {
        let contentInsets = UIEdgeInsets.zero
        scrollView.contentInset = contentInsets
        scrollView.scrollIndicatorInsets = contentInsets
        
    }