At 12:57 -0400 25/3/09, I. Savant wrote:
You can certainly have more than one class declared and implemented
in the same .h/.m files. You can also have multiple controllers within
the same XIB. Wherever your classes are declared/implemented, they
show up as "available" in Interface Builder as individual classes, so
when you instantiate them, they appear as if they were
declared/implemented in different files. IB does not care.
This is not strictly true - the interface for the class must be in a
.h file. Interface Builder does not appear to search implementation
(.m, .mm, etc) files.
May I ask why you don't want separate source code files for separate
classes? If they're all heavily related (such as NSTabView /
NSTabViewItem), it makes some sense, but if they're separate
controllers, you're just cluttering your files. It's far easier when
you have one class (or one small group of two or three related
classes) in one file because you can easily find them in your source
tree. Combining lots of source from multiple medium-to-large classes
in a single file will undoubtedly make navigating your code harder,
and will probably slow down the editor. It's easier in this case just
to separate your classes into their own files.
It is clearly the "Cocoa Way" to have one class per .h/.m file pair.
And probably even could be said it is the "OO Way".
It is, as you note, sometimes sensible to have tightly coupled
classes in the same file. Probably my most common case for this is
NSWindow/NSWindowController subclass pairs (but I'm doing lots of
special look NSPanels from a background app so that might explain
it). Often the NSPanel subclass is almost trivial.
But I'm a bit uncertain when you would have two tightly coupled
controllers that could not simply be a single controller, so perhaps
the OP would like to post the reason why he wants them together (the
reason why you are asking a question is often helpful in determining
the best answer which is not always the answer to the question
posted).
Enjoy,
Peter.
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