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CHAPTER 20 MODEL-VIEW-CONTROLLER PATTERN
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property of this button is bound to the isStarted property of the game object. Before the game begins, while isStarted is NO, the button is disabled. As soon as the game starts, the button becomes enabled. There s no code in the game object to enable or disable the button, and the button doesn t know anything about the Tic Tac Toe game. The enabled property of the view is simply bound to an observable BOOL property of another object; no additional programming is required. If you need to create a binding programmatically say, for a view object you created programmatically send a -bind:toObject:withKeyPath:options: message to a Bindings-compliant observer. If you are creating custom view objects to display custom data, it s more expedient to create an informal binding between the view and data model objects. This is just a fancy way of saying, roll your own MVC communications. Your custom view should implement the fundamental MVC communications using Objective-C messages, notifications, and observing. The view should use direct knowledge about the controller and data model, rather than trying to create an abstract, reusable view class that communicates through bindings. In the TicTacToe project, the ChalkboardView object is a good example. It displays a Tic Tac Toe game and sends move actions to its controller when the user clicks on the board. The object knows it is connected to a TTTDocument controller and it explicitly observes changes to its game property. The object conforms to the MVC design pattern, but isn t abstracted beyond its purpose.
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Before I get too far into the details of view objects, events, and controllers, I ll take a moment to shed some light on some of the magic of Cocoa application development. If you re not used to developing with Cocoa and I assume that you aren t or you wouldn t be reading this book you are likely to open the TicTacToe project and start scratching your head. The Objective-C source code clearly implements the functionality of the objects, but you can sift through the code line by line and never find any of the following: Code to create a document window, or any of the view objects in that window Code that connects the document object to any of its view objects Code that binds a view object to a controller or data model property Code to connect view objects (like buttons and menu items) with the controller object that implements those actions All of these tasks are accomplished through Interface Builder, an essential development tool that makes Cocoa application development effortless and simultaneously mystifying. In a nutshell, Interface Builder edits NIB files. NIB files, which you remember from 4, contain an archived (serialized) representation of the objects you want to instantiate at runtime. The archived objects include properties and inter-object references. The NIB file is part of the application bundle. When a NIB file is loaded at runtime, the objects are unarchived; this instantiates the graph of objects, sets their properties, and connects any inter-object references. If you read 12 about archiving, what NIB files accomplish isn t a great mystery. If you come from another development environment, keep in mind that Interface Builder is not a code generator. It does nothing but edit a virtual representation of the objects that will be instantiated at runtime via standard archive decoding. There s no magic involved, nor is any code generated. The end result is identical to unarchiving a graph of objects that were previously created programmatically. If you understand that basic concept, Interface Builder s role in development and how the objects in a NIB document get created and initialized ceases to be a mystery. It s one thing to say a view object sends an action message to its controller when the user clicks on it, and another to actually implement it. In Cocoa development, that connection between those objects and the message that gets
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