Xcode 8 hangs / unresponsive when opening storyboard

Question

I\'ve recently upgraded to Xcode 8 and updated my project to Swift 3. All worked fine for a little while. Storyboard loading has always been slow (even when still running Xcode

Answer 1

1. open a Finder window and navigate to your project
2. right-click on the .xcodeproj file (it’s a package actually)
3. select Show Package Contents
4. a new window appears
5. delete a folder called xcuserdata
6. restart your mac