Sometimes I find when I am using Interface Builder the view I want to edit disappears. You open the xib file click on the view you want to modify and nothing happens. I have tried multiple clicking, clicking really HARD but I always get the same result. The view will not appear. The issue appears most often when using a second screen, the view you want edit is on the second monitor, but you are semi unplugged at a coffee shop.
The easiest way to fix this is to click (gently) on the view you want to appear. Now hit Cmd W to close the window. Now click (normally) on the view and it will magically appear on your screen.
This has happened to me pretty often so I thought I would share the solution.