title: Tab bar item frame bug?
body: <p>Hello I have a problem with TabBar
  I would like to get the frame of a UITabBarItem in a UITabBar, in the past (swift 2) I got the result using :
  <code>let frame = self.tabBar.subviews.last?.frame</code>
  Now (swift 3) the same command I get a frame that does not have the width of any of UITabBarItem frame.
  In particular I tried to print the subviews of <code>self.tabBar</code>
  using the code below:</p>
  
  <pre><code>    for i in self.tabBar.subviews{
          print(i)
      }
  </code></pre>
  
  <p>obtaining this result:</p>
  
  <p><a href="https://i.stack.imgur.com/wZhtX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wZhtX.png" alt="enter image description here"></a></p>
  
  <p>instead seeing the debug view it is clear that the subviews of UITabBar are 3 (_UIBarBackground, UITabBarButton, UITabBarButton).
  And if I print the description it is clear that they are different.</p>
  
  <p><a href="https://i.stack.imgur.com/WrpiB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WrpiB.png" alt="enter image description here"></a></p>
  
  <p>any suggestions ? I forgotten anything?</p>