title: How to hide BottomNavigationBar when scrolling - Flutter
body: <p>I need to implement in Flutter the hide / show feature of the BottomNavigationBar when the user scrolls the scroll down or up.
  Please, if you know how to do it or have an example of how to do it and can share it, I am grateful for the help!</p>
  
  <p><a href="https://github.com/flutter/flutter/issues/23674#issuecomment-449439953" rel="nofollow noreferrer">Here is the link of my question there in github</a></p>
  
  <p><strong>An example of what I want</strong></p>
  
  <p><a href="https://i.stack.imgur.com/Xd033.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Xd033.gif" alt="enter image description here"></a></p>