On 24/10/2008, at 4:42 PM, Carlos Weber wrote:
No one can have a complete understanding of MVC without hearing
James Dempsey (an Apple engineer) explicate it:
http://www.youtube.com/watch?v=YYvOGPMLVDo
Excellent. And I thought MVC was Mountain View, California!
Actually, I first came across it while doing MacApp about 20 years ago
and reading Brad Cox's book on some obscure language called Objective-
C... whatever happened to that?
James's observation about a string maybe containing a phone number or
the works of Aristotle not being of concern to the view, but being in
the Model's domain does raise the difficulty in it – where does
semantics of information come in and specifically validation. With web-
based applications, we are putting more into JavaScript, where the
view may check that something looks like a phone number (rather than
the works of Aristotle), thus giving a user a better interface (error
message, rather than "Windows has found an error, error number 60532,
click here to find out more information about what this is about"). It
can also provide a faster feedback loop to the user than sending a
message to a server to get "Invalid data" back.
As for the original question. there aren't hard and fast rules about
MVC, but it certainly helps design any app by using its guidelines.
Within Cocoa, however, there is a lot of support with Core Data
helping with the model and bindings helping with doing a lot of that
boring controller stuff, and obviously nib files (xib, and Interface
Builder) isolate the view for you.
Ian_______________________________________________
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