I'm not sure that there will ever be one - dev's main platform of interest is windows PC, Android build is "by the way" as it's not that hard to maintain, yet he deliberately didn't create macOS/iOS/Linux builds so far cuz fixing potential issues would be a pain in the ass, especially that the game's code is not prepared to be launched on different platforms.
He has a plan to rrewrite the code to increase the maintainability in the future, then he'll drop Linux/macOS versions but I haven't heard him ever saying anything about iPhones.
Cheers