Because those particular accessors appear to be specific to the
mentioned classes.
No, they're not -- they're fundamental to KVC and KVO; they will work
with any class that leverages these technologies...
If they are going to try to use them, their documents
should clue you in and at least provide the reference you guys
sent. (Ok,
the documents headers do vaguely reference the Key-Value Coding
Guide, along
with a few other encyclopedic references.)
... the documentation makes abundantly clear that a full understanding
of KVC and KVO is a prerequisite for using bindings. If you've failed
to meet those prerequisites then a failure to understand is yours alone.
To reiterate a point Erik made, it is not clear why some here seem to
think that it should be possible to dive headlong into a complex
environment and expect everything to make sense. There are good
pedagogical reasons why the documentation -- and some of us answering
questions here -- stress the importance of learning the fundamentals
first.
mmalc
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