What language are iphone apps written in?

What language are iphone apps written in? - 1

Either one of Apple's proprietary languages such as Swift, or by using independent tools that work for multiple different systems you can use C, C++, Lua, Rev etc.

With those, the app or program can be built for Apple iOS, Android and laptop/desktop system just by selecting the target system and re-compiling the same source program.

[Apple's Swift can't be used with Android; Android's Java can't be used with Apple/iOS].

Examples:
https://www.madewithmarmalade.com/

https://livecode.com/

[Apple's Swift can't be used with Android; Android's Java can't be used with Apple iOS].

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