Is iOS written C++?

1 Answer. The mach kernel would be written in C, with Assembler thrown in to boot. Above that layer, the device drivers be written in same language, C, as well that interacts with the kernel, think graphics, sounds etc. Above that level, the runtime libraries would be mixture of GNU libraries, mostly C, C++.

Is iOS written in Swift?

If apps such as Health and Reminders are any indication, the future of iOS, tvOS, macOS, watchOS, and iPadOS rely on Swift.