title: Moving button up when keyboard is enabled
body: <p>This is the code i wrote to move the button up when the keyboard is enabled:</p>
  
  <pre><code>@IBOutlet var lastNameText: HoshiTextField! 
  @IBOutlet var firstNameText: HoshiTextField!
  
  override func viewDidLoad() {      
          var fab = MDCFloatingButton()
          fab.translatesAutoresizingMaskIntoConstraints = false
          fab.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant:-30.0).isActive = true
          fab.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant:-240.0).isActive = true
          NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name:.UIKeyboardWillShow, object: nil )
          NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name:.UIKeyboardWillHide, object: nil)
  
          @objc func keyboardWillShow(notificaion: NSNotification) {
              if let keyboardSize = (notificaion.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue{
                  //fab = UIButton(frame: CGRect(10+20, self.view.frame.size.height - keyboardSize.height - 40,80,30))     
                  fab.frame = CGRect(x: 320, y: 350, width: 60, height: 60)    
          }       
   }
  
  @objc func keyboardWillHide(notification: NSNotification ) {
      if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue{
          fab.frame = CGRect(x: 320, y: 350, width: 65, height: 65)
      }
  }
  </code></pre>
  
  <p>Please give input.</p>