title: how to use UIToolbar above UICollectionViewController?
body: <p>today I am learning how to use UICollectioViewController, but I have a problem. I wanna add a toolbar above a UICollectionViewController, but I dont know what to do. Dragging a UIToolbar into storyboard just make UICollectionViewCell dissappear. I wanna make something like in this pic : <img src="https://i.stack.imgur.com/xC7bj.png" alt="enter image description here"></p>
  
  <p>is there somebody can help me? :)</p>