If you are already familiar with high-level Objective-C, I would recommend looking at the headers for the language runtime. All of the inner workings are expose

If you are already familiar with high-level Objective-C, I would recommend looking at the headers for the language runtime. All of the inner workings are exposed as C functions you can play with. Also take a look at Mike Ash's blog, which dives into a lot of details: https://mikeash.com/pyblog/?tag=objectivec https://mikeash.com/pyblog/?tag=objectivec Also: http://www.sealiesoftware.com/blog/archive/index.html http://www.sealiesoftware.com/blog/archive/index.html