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1 Apple Inc., Cocoa Bindings Programming Topics, http://developer.apple.com/documentation/ Cocoa/Conceptual/CocoaBindings/, 2009.

I Identification of boxes, enclosures, transfer switches, generators, etc I Wiring independence and exceptions I Fire protection for high-occupancy and high-rise buildings

FIGURE 16-3

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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The section on sources of power gives the response-time requirements for the restoration of emergency lighting, emergency power, or both as not to exceed 10 seconds for the specific classes of buildings stated previously In selecting the emergency source of power, consideration must be given to the occupancy and type of service rendered in those buildings The occupancy classes are given as (1) assembly, (2) educational, (3) residential, (4) detention and correctional, (5) business, and (6) mercantile Article 700 requires that power sources be installed in rooms protected by approved automatic fire suppression systems (sprinklers, CO2 systems, etc) or in spaces with a 1-hr burn rating (Fire can surround or be adjacent to the room for at least 1 hr before its fire-resistant integrity is lost and its contents begin to ignite spontaneously) The four emergency power systems approved by Article 700 are

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.

CHAPTER 16:

Storage batteries (rechargeable) Generator sets Uninterruptible power supplies (UPS) Separate services (alternate outside utility or inside generation) in accordance with NEC Article 230 The section on emergency system circuits for lighting and power covers:

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.

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