This project demonstrates running an aiohttp server on an iOS device.
I created it using the Python iOS Template. I didn't check the frameworks into this repo, so you'll need to download and extract them here before you build.
I had to include wsgiref.handlers.format_date_time myself because aiohttp depends on it and wsgiref is excluded from the standard library in the Python.framework build.
I haven't tried to implement a UI yet, so iOS will kill the app after a few seconds if you're not running in Xcode.
If you're running the app in the iOS simulator, you can connect to the server using cURL. You'll need to change the IP address if you're using a real device.
$ curl --verbose "http://127.0.0.1:8080/events"
The app binds to 0.0.0.0:8080 and exposes an event source at /events.