Let's say in Apple API version 1.0, there is a class NSFoo with a property 'color'. API 1.1 adds property 'size'. I want to know whether I can use the getter: myFoo.size [myFoo respondsToSelector...

I'm looking to make my app compatible with older versions of iPhone OS. I did see weak linking mentioned as an option. Can I use OS version detection code to avoid code blocks that the OS can't han...

How portable is weak linking? #pragma weak my_symbol I see that question: how-to-make-weak-linking-work-with-gcc discusses how to get it working. But is there a good way to do this such that gc...