On Cocoa Bindings – “Let Us Break Their Bonds Asunder”
Chances are, if you’ve developed any kind of Cocoa application, you’ve probably made use of Cocoa Bindings in one way or another, particularly when it comes to Core Data. The technology is ‘key’ to so many of the underlying frameworks but it is a technology that tends to be often-used but frequently not fully understood.
If you are someone who happily binds Array Controllers and View objects together using Interface Builder but have always wondered discretely exactly how the magic behind the scenes happens, or if you just don’t quite comprehend the difference between ‘KVC’ and ‘KVO’ (or perhaps can never quite remember what they stand for…), this article might help you out. In it, I’ll attempt to demonstrate a ‘faux-bindings’ methodology that connects a value from one object with a value from another object, but without using the actual Apple Cocoa Bindings technology. The bare-bones of how the ‘faux binding’ works will be there for all to see; while the internal workings of Cocoa Bindings are a little different, this will hopefully at least show you what, how and why certain things are required for the real Cocoa Bindings to work successfully.
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