I have watched Congressman Keating since his election. He is an strong and dedicated to constituents. I am a Realtor who believes in protecting property rights of homeowners. Congressman Keating understands the housing issues such as Flood insurance, protecting the Mortgage Interest Tax Deduction and other such issues.
Judging for the closed-ness of Apple, you probably won't get much credible answer from Apple's own people. OS X and iOS are primarily written in Objective-C with some C++ in between (e.g. IOKit, WebKit, etc) and probably some C as well for the kernel stuff. However looking at Apple's software engineering jobs vacancies [1], these are also relevant programming languages at Apple: Java.
You could learn Swift, the replacement language for Objective C. Apple even put out free books online and classes on iTunes University to get people to use it. There are not as many resources for how to develop games for it. And I do not want to use Apple. So learn Java, because thatâs the primary platform for mobile games on Android.