Xcode 10 storyboard not showing elements, only blue border [duplicate]

Question

After I upgrade to Mojave and update to Xcode 10 my storyboards are not showing any element, just displaying a blue border.

How can I fix this!

EDIT: The answers given here Here do not resolve my problem.

Answer 1

Try these solutions:

1. Try to quit Xcode, then clear derived data first then open the Xcode project.
2. I attached a screenshot, make sure "Automatically Refresh Views" should be checked. Also, click on 'Refresh All Views' option.

Note: Try to enable and disable again to this property: 'Show Bound Rectangles'