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.
About Swift. Swift is a new programming language for iOS, OS X, and watchOS apps that builds on the best of C and Objective-C, without the constraints of C compatibility.Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun.ll this makes Swift a sound future investment for developers and for Apple. Swift is a fantastic way to write iOS, OS X, and watchOS apps, and will continue to evolve with new features and capabilities. Our goals for Swift are ambitious.