Why do view controllers in my Storyboard keep disappearing?

问题

The View Controllers in my Storyboard file keep disappearing.

As of now I have to press the up arrow and highlight over every single item to reinstate my view controllers.

What can I do to get rid of this problem and is there something else I can do to reinstate these disappearing view controllers onto my storyboard?

回答1:

This is a bug... Usually i'm able to fix it by closing the storyboard and re-opening it.

回答2:

I was able to fix mine by resetting xcode completely. Try this: http://www.developers-life.com/uninstallresetting-xcode.html

来源：https://stackoverflow.com/questions/9520641/why-do-view-controllers-in-my-storyboard-keep-disappearing