title: how to change left border color of the indented UItableview cells
body: <p>I have been learning Swift and iOS programming by building a HN reader app. Everything is working so far. But I 'd like to add some features, one of them being displaying a colored left border for each tableview cell. The color depends on the indent level of the cell which is set by manipulating the left margin (heading) NSLayoutConstraint. What I want to achieve looks like something in the picture below.</p>
  
  <p>Any ideas as to what property I could change to get this effect? Thanks and appreciated your help.
  <a href="https://i.stack.imgur.com/zncZU.jpg" rel="nofollow noreferrer">intended effect</a></p>