title: how to activate two viewControllers of an tabBar View?
body: <p>I want to activate Favourites tabBarItem as a child over a parent viewController's AllServices tabBarItem and i want to keep both tabBarItems activated.</p>
  
  <p>Favourites is a collectionView</p>
  
  <p>The image below describe my question.
  AllServices is the ParentView controller and Favourites is ChildView
  by the way i'm using StoryBoard.</p>
  
  <p>So, please help me.</p>
  
  <p><img src="https://i.stack.imgur.com/bCEmf.png" alt="enter image description here"></p>