Hello there everyone.
I've got numerous support projects using old school development. Things from Objective-C to RxSwift and UIKit.
I've tried the LLM/Agents and they just destroy the codebase over time, so I have given up.
The final straw was trying to get it to fix a POSTCODE validation issue which was using some novel ways to provide validation in place using RxSwift.
Has anyone had any luck with these LLMs on Legacy codebases? Would love to hear tips.