How do I call +class methods in Objective C without referencing the class?

Question

I have a series of \"policy\" objects which I thought would be convenient to implement as class methods on a set of policy classes. I have specified a protocol for this, and

Answer 1

This

id  counter = [[Model availableCounters] objectAtIndex:0];
return ( [counter countFor: nil] );

Should be

Class  counter = [[Model availableCounters] objectAtIndex:0];
return ( [counter countFor: nil] );

In the first you have an instance that conforms to . In the second you have a class that conforms to . The compiler warning is correct because instances that conform to don't respond to countFor:, only classes do.