UIViewController class with IBOutlet collection still has connections to no longer existing storyboard

Question

So, I have a class that still has connections to a deleted Drawers.storyboard file.

How do I 'clean' or remove the old connections to the non existing storyboard?

Answer 1

Fixed it. It looks like it was a cache issue....

I did this in the terminal:

rm -rf ~/Library/Caches/com.apple.dt.Xcode ~/Library/Developer/Xcode/DerivedData/*

Answer 2

Here is an easy way to solve this:

1.) Rightclick on your project. 
2.) Show in Finder
3.) Find the "Drawers.storyboard"
4.) Drag it into your project again.
5.) Enter the storyboard and right click on the view.
6.) Remove all connections.

If I'm wrong, please tell me and I'll edit my answer.