title: Xcode: invalid variables view while debugging selected view
body: <p>I have a subclass of UIButton, I'm using it in a storyboard. I'm adding some sublayers to its layer in the layoutSubviews() function. It shows up live fine in the storyboard.</p>
  
  <p>In the storyboard, I'm doing Editor->Debug Selected Views. The breakpoint I've set is hit, but I can't inspect variables like "self" or "layer"</p>
  
  <p><img src="https://i.stack.imgur.com/3KKSQ.png" alt="enter image description here"></p>
  
  <p>Why is that? </p>
  
  <p>(lldb) po self
  error: :1:1: error: use of unresolved identifier 'self'
  self
  ^</p>
  
  <p>(lldb) po layer
  error: :1:1: error: use of unresolved identifier 'layer'
  layer
  ^</p>
  
  <p>Xcode Version 6.3 (6D570)</p>