I have been helping out a teammate with a code fix but never wants to try my code solutions, instead he always complaints about it, even if they work and comply with the conventions. (I am his dev lead)

It may take a while but walk him through the logical steps you took to your solution and he will likely be more receptive. Its better to teach him to think than just suggest a solution that works. I have been in your situation, and it seems to help most of the time.

Thanks @Morosuke , I'll give it a try