Objective-C Astronomy Library

Question

I need to do some moonrise azimuth and time calculations. Can anyone recommend a good astronomy library, preferably in Objective-C?

Answer 1

For those still interested in 2016, I've made an Objective-C(++) and Swift wrapper around PJ Naughter's AA+ library. It is based on the Astronomical Algorithms book by Jean Meeus and it is open-source on GitHub:

https://github.com/onekiloparsec/SwiftAA