mXMRig is a high performance RandomX, KawPow, CryptoNight, Ghostrider and AstroBWT unified CPU miner for iOS platform
You can find more info here: https://www.mxmrig.com
Unfortunately I'm not proficient at CMake, so building requires a lot of steps. You have to use cmake to create *.xcodeproj (original cmake creates projects with absolute paths 😞). The generated project will be a macos command line app. After manually converting it to iOS and fixing all build issues you'll be able to actually create a binary and run it on the device. I would really appreciate if someone could fix the cmake file to generate iOS-compatible project out of the box!