title: How to hide header on scroll in ionic 4?
body: <p>I wanted to know how I can hide a header in Ionic 4 by scrolling down the page, and re-show it when scrolling up.</p>
  
  <p>I found many solutions on how to do that, but they all turned out to not working or being out-of-date.</p>
  
  <p>So I collected all piece of information I could find to provide this answer.</p>