Can I use NSInvocation for a class method? I can't really see what to
use for setTarget: as there isn't an actual object.
Or there might be a better way to do what I want to do...
I'm trying to set up a simple scheme that maps file types to a method
that can interpret and decode that file type. The idea is to avoid
subclassing my document class to extend the file types it can open -
instead just supply a method in a category then register it against
the file type. When the document is asked to open the given type of
file, it looks up the category method it has registered against that
type, and invokes it.
For importing a file, the method in question would generally be a
class method (file data in -> instance of data model class out) so my
idea of using an NSInvocation might not be workable there. I need to
wrap the invocation (selector/class/target) in some sort of object so
I can put it into a dictionary, and since NSInvocation already is such
an object it seemed like the obvious choice.
tia,
cheers, Graham
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