How to detect a property return type in Objective-C

Question

I have an object in objective-c at runtime, from which I only know the KVC key and I need to detect the return value type (e.g. I need to know if its an NSArray or NSMutable

Answer 1

If you know that the property is defined :

        id vfk = [object valueForKey:propertyName];
        Class vfkClass = vfk.class;

And compare with isKindOfClass, isSubClass, etc.