What is the point of key-value coding?

Question

Since Objective-C 2.0, we\'ve had @properties and autogenerated accessor methods. So today, what is the point of key-value coding? Under what circumstances is it

Answer 1

KVC can be useful if you are using Key Value Observers to detect value changes on an object. If you wanted to use KVO and @properties you would have to wrap every mutator method with:

[self willChangeValueForKey:@"bar"];
bar = foo;
[self didChangeValueForKey:@"bar"];