Xcode 11 not opening after updating to mac os 10.15 Catalina

I was able to work around this by uninstalling Xcode first. What I did:

• Open Finder and navigate to Applications.
• Move Xcode from Applications to Trash.
• In the terminal, run the command rm -rf ~/Library/Developer
• In the terminal, run the command rm -rf ~/Library/Caches/com.apple.dt.Xcode
• Restart your machine.
• Now go to App Store and search for Xcode and install it from there.

This works for me.

Close you project then Go to your project file > right click on project_name.xcworkspace > Show Package Contents > delete folder xcsharedata and xcworkspace.

It will create deleted file again once you open that project

Xcode 11.1 is available on the Mac App Store now so you should probably be using that. Try a force brute approach by deleting Xcode 11, redownload and reinstall.