Q:

Xcode variables view empty values while debugging

I cannot see the value of variables while debugging my app. I have already checked the build settings and optimization values are set to none, also my Scheme. See screenshots below:

A:

The idea is to remove things from your bridging-header one by one and see if you can narrow down the issue.
I think I read somewhere that if a library is causing many issues behind the scenes, this can stop your debugger working.
In my case 
I was using Facebook Tweaks library
Once I got rid of it, I got my debugging back.
and in my AppDelegate.swift
import Tweaks into the AppDelegate file.
 import Tweaks

