What programming language is used for developing iOS?

Welcome to SoloLearn forum! Why this is happening? Create an iOS App on iPhone Как заставить работать код python в sololearn ? Front end web developer (React.js) What programming language should I learn to make a game Please suggest any app for making program related to matplot Как вывести сумму счетчиков? Why do I keep getting low scores in python challenges even if In OO languages, what is the advantage of using factory methods