A collection of #RPi and Mac / iOS resources. Especially with iOS, having a full Unix environment for programming access is a good fit.
Tether RPi to iPad Pro via Ethernet over USB-C
With the new RPi4 having USB-C, this is a good fit for iPads.
Raspberry Pi Zero connected to MacOS over USB
https://justinmiller.io/posts/2019/09/21/pi-gadget/
$20-30CAD for the RPi Zero W makes this very low cost.