i must have misunderstood categories made category on class extend methods, , make methods abstract following oop guidelines. thought when #import , use category methods in category called. instead find when #import , use base class, class automatically call method in category on class, not itself.
what wanted if user tried use method in class without category exception trowed. , way make different categories on same class different internal behavior.
am misunderstanding categories ?
categories add methods class without condition or other means of picking , choosing.
once methods added class, there no removal short of mucking runtime directly.
subclasses inherit additional methods.
it doesn't matter if #import method declarations or not.
if want different versions of class, declare different subclasses.
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