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CHAPTER 1 INTRODUCTION
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contains that, and eventually the single application object that contains all of the windows. When the user selects the Paste command from the menu, Cocoa examines the objects in the chain to find the first one that implements a -paste: method. Similarly, the menu item itself is enabled and disabled automatically, based on the presence or absence of an object in the responder chain that implements paste:. This arrangement does not require any object to look for a Paste command event or register itself with the menu item. The Paste command comes to life simply because an object implemented a paste: method. But, you might ask, what if the Paste command needs to be enabled conditionally That s simple: your custom view object should implement the -validateMenuItem: method. Objects in the responder chain that implement that method are queried to determine what commands should be enabled for the user. Otherwise, the Cocoa framework makes up its own mind. The emphasis here is not on what an object is but what it does. The capabilities or roles of an object are determined by examining what methods it implements, rather than what class it is or requiring it to register itself with other objects. This philosophy has its roots in aspect-oriented programming. Objective-C developers call these methods informal protocols. The end result is a fluid application that adjusts itself and responds to users based largely on what functions the objects in the program do, or don t do. The knowledge required by one object about another is minimal, as are its relationships to other view objects. In Objective-C, object implementations are simpler, more encapsulated, make fewer assumptions, and are generally more reusable.
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For all of the reasons just mentioned, Apple considers Objective-C its secret weapon. Apple regularly produces high performance, cutting-edge applications faster, and with fewer developers, than other major software companies. They publicly attribute Objective-C as a key component in their success. After you begin to work with Objective-C, especially when building GUI applications, you ll discover just how productive and efficient you can be.
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Computer systems and software change continually, and computer languages change along with them. You will probably change computer-programming languages several times. I ve changed my principal programming language at least eight times during my career, with side excursions into a dozen or more other languages along the way. Becoming proficient in a new language requires a significant investment, so there s a natural resistance to migrate away from a language with which you are already comfortable and productive. Yet, the reward for learning a new language is often access to new opportunities, technologies, and markets. Objective-C is the preferred programming language for Apple s Mac OS X operating system, and (as of this writing) the only language for developing native applications for Apple s iPhone and iPod touch products. Given that change is inevitable, anything that will minimize the transition to a new programming language is welcome. That is the reason I wrote this book. It took me years to become proficient in Java. It took me years to become proficient in Objective-C. Only afterward did I begin to see the striking similarities between the two. The similarities are not found in the languages themselves Java and Objective-C are as different as the Moon and Manhattan. The similarities are in the solutions; that is, how the architects of Java and Objective-C solve problems. Effective software development is less a matter of knowing the syntactical details of a language (although that s clearly important), than the ability to create solutions. As an experienced Java
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CHAPTER 1 INTRODUCTION
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programmer, you ve accumulated a toolkit of solutions to address all kinds of common programming problems. When you start a new language, you abandon those skills for a completely new set of tools and techniques which is ironic, since you re often solving the same set of problems you were before. This book aims to reduce that agony by providing a kind of translation service between the solutions you already understand in Java and equivalent solutions in Objective-C. The problems are the same and you ll discover that the philosophies of the solutions are remarkably similar. What s often radically different is the technique. To give you an example, consider the method to draw a string of characters on a graphics display. In most object-oriented languages, the logical place to implement this method is in the drawing object class the class responsible for drawing primitive shapes in a graphic context. In Java, the class is java.awt.Graphics and the method for drawing a string is drawString(String,int,int). In Cocoa, the base graphics context class is NSGraphicsContext. But in it you won t find any drawing primitives. The method to draw a string is found in the NSString class itself. The methods are drawAtPoint:withAttributes: and -drawInRect:withAttributes:. Being used to working in Java, you probably have a question or two. You might be wondering how the system s primitive string class was subclassed to include a -drawAtPoint:withAttributes: method. Or, you might want to know what idiot system architect decided it was a good idea to include something as domain specific as a graphic drawing primitive in the base string class. The answer is neither. Objective-C allows arbitrary methods to be attached to other classes. In this case, the AppKitFramework (the core framework for all GUI applications) attaches a drawAtPoint:withAttributes: method to the base string class. It s called a category, and it stands the normal rule of class method organization on its head. If you went looking for a drawString:AtPoint:withAttributes: method in the various NSGraphics classes you would as I did waste hours of time. Eventually finding them in the NString class was my first introduction to ObjectiveC categories and forever changed my approach to class method organization. It also changed my habits for searching the documentation. But the really valuable lesson I learned was that Java and Objective-C are still more similar than they are different. Both embrace the Model-View-Controller design pattern. Both organize window contents using a hierarchy of visual container objects. Each container has a -draw (paint()) method that is called when its contents should be rendered. The -draw method uses a graphics context object to perform the actual drawing of lines, polygons, strings, and images. The differences spring from the design of the Java and Objective-C languages. Objective-C lets you attach methods to other classes while Java does not. This changes how class authors organize methods, but doesn t change their basic purpose. As an accomplished Java developer, you don t need a lesson in graphic containers or an explanation of how or when to draw lines. What you need to know is that in Java the string drawing primitives are found in the java.awt.Graphics class, and in Cocoa they re in the NSString class. You ll also want to know how categories attach a method to another class and how to implement your own.
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