I just wish someone would do this for iPad. I know the market is small, but there's nothing even attempting this for iPad.

Some things to look at:

    - Kodex
    - GoCoEdit
    - Textastic (pair with Working Copy)
    - Code Editor (unsupported, formerly Coda)
    - Codea
And if you’re online:

    - https://github.com/coder/code-server
(see: https://coder.com/docs/coder/latest/comparison )