title: iOS) How to add a separator at tabbar dividing two tabbarItems
body: <p>I want to customize tabbarItem having footer line meaning it is selected and have a thin line separating two tabbaritems.</p>
  
  <p>But even though searching at stackoverflow, it shows very limit information and low quality.</p>
  
  <p>My tabbar is simple intuitively, having bottom line and a separator.</p>