how can you find out if an NSObject has a certain property?

Question

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: myFo

Answer 1

You're close. Your selector should be exactly the message you want to send to the object:

if ( [myFoo respondsToSelector:@selector(size)] ) {
    int size = [myFoo size]; // or myFoo.size in dot-notation.
    // ...
}

should work.