Cocoa Bindings: How It Works in Java

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Cocoa Bindings: How It Works
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While a complete and accurate description of the implementation of Cocoa Bindings is outside the scope of this book, it may be useful for you to get a fuller picture of how it uses KVC and KVO to do its work. Now that you ve gotten a brief intro into KVC and KVO, let s take a look at how these bits fit together. When you establish a binding in Interface Builder, like you ve done numerous times in this chapter already, you re actually defining a sort of contract. You re declaring that when this nib is loaded and these objects are set up, a sequence of events will occur to establish some KVO relationships between the objects, using a key path string (using KVC) to define which attribute is in focus for each binding, along with other information to identify which aspect (e.g. the displayed value, the enabled state, and the like) of the receiving end (typically a GUI control) should be affected by changes in the underlying value. At runtime, then, Cocoa will set things up so that the control (or any other object you ve established a binding on) will be set up to observe changes in the controller based on the relevant key, and the controller will be set up to observe changes in the control s chosen aspect.
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CHAPTER 6: Cocoa Bindings
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In Conclusion
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Bindings are a really powerful technology, and in retrospect you can probably see that s it s possible to implement nearly everything shown in s 4 and 5 using Cocoa Bindings, creating an app with almost no custom code whatsoever! This doesn t in any way diminish the usefulness of the techniques shown in previous chapters, however. The fact is that sometimes you will want to access values in the GUI manually, in methods called by target-action. A general rule of thumb is that if you re in a situation (a simple app, or a subcomponent of a larger app) where you don t have any apparent model objects to work with, you may be best served by doing things the old way, but, in general, Cocoa Bindings are the preferred method for developing Mac apps from here on out. In the next few chapters, we ll show you how to do even more with bindings using Core Data. Core Data s functionality is orthogonal to Cocoa Binding s; whereas Cocoa Bindings lets you eliminate some boring controller code, Core Data takes care of a lot of the plumbing that you d otherwise have to write for your model classes, giving you a storage back-end, built-in Undo/Redo support, and much more. Together, Cocoa Bindings and Core Data can get you building so much software, so effectively, you ll be making other people s heads spin!
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Core Data Basics
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In earlier chapters, we ve shown you various ways that Cocoa lets you display data in view objects, from manually getting and setting values based on the contents of model objects to having the data automatically synchronized between model and view objects using Cocoa Bindings, which eliminates the need for a lot of boring controller code. Now it s time to learn about Core Data, a powerful framework that gives your model objects a complete set of built-in capabilities. We ll start by telling you a bit about what Core Data is and how it fits in with the other parts of Cocoa. Then you ll use Core Data to create a full-featured database application called MythBase, including a GUI that allows you create, search, edit, and delete entries, all without writing a single line of code (see Figure 7 1 for a shot of MythBase in action). Then we ll explore some of the code resources that are created for you automatically when you create a Core Data project, and finally we ll show you how to add functionality ( business logic ) to your model objects.
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