I have installed a new Xcode version 11.1 in my mac and open my existing project, while i’m trying to open my storyboard its completely shown black UI.

I have installed a new Xcode version 11.1 in my mac and open my existing project, while i’m trying to open my storyboard its completely shown black UI.

had the same issue, all i did is
clear constraint, for my case the source was from UITableView, and make sure constraints are attached to safeare not superview.

from toolbar on the top go to Editor > Canvas > Layout Rectangle Very important you have to repeat this step 3 times
Quit XCode and reopen it again , all should be fixed
I've noticed this happen when i switch view for different devices 8, 11, 4s
Good luck