Broken xib with xcode 10.3

Question

Unable to view or manipulate all xib file after updating xocde to 10.3 version.
Is there any solution for that?

My OS version: 10.14.4 (18E226)

Delete Derived data[Not working]

Answer 1

Completely delete your derived data from preferences and later restart your machine.

Answer 2

Restarting the computer fixed the problem. At least for me.

Answer 3

I had a similar problem after these install problems:

1. App Store upgrade of Xcode stalled (similar to Xcode - how to reset glitched Xcode 10.2 installation?)
2. Safe mode reboot stalled
3. Downloaded 10.3 from https://developer.apple.com/download/more/
4. New Xcode had no Simulators installed -- OK, fix that

After all that waiting, an opened project looks like this

The above described remove-DerivedData-restart fixed this. OK, that's post hoc reasoning, ymmv.