Does Xcode/Interface Builder document connections between ui widgets and various other assets, e.g., code, other widgets? If so, how does one produce such documentation?
Xcode/Interface Builder Connection Documentation
To my knowledge, IB doesn't 'document' anything for you.
A DIY approach would be to add your own comments, and then harvest those. Perhaps Xcode's ability to 'Auto generate Quick Help documentation' would suffice?
https://stackoverflow.com/questions/38071289/xcode-8-auto-generated-quick-help-documentation