Writing NSLog to a local file on the device (iOS)

I have an application that currently outputs through NSLog for certain things, and I want to have those outputs be written to a local file.

I have been using this article: Save NSLog into a Local File

It was answered by stack overflow user Josiah, so thank you for that Josiah!

I want to use the code presented in the linked question, but I am not sure of how to format the self created logIt method to replace the NSLog calls.

Can anyone help a fledgling iOS coder?

Thanks!