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Before You Start
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Before you read this book, you should have some experience with a C-like programming language such as C++, Java, or venerable C itself. Whatever the language, you should feel comfortable with its basic principles. You should know what variables and functions are and understand how to control your program s flow using conditionals and loops. Our focus is the features Objective-C adds to its base language, C, along with some goodies chosen from Apple s Cocoa toolkit. Are you coming to Objective-C from a non-C language You ll still be able to follow along, but you might want to take a look at Appendix A or check out Learn C on the Mac by Dave Mark (Apress 2009).
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CHAPTER 1: Hello
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Cocoa and Objective-C are at the heart of Apple s Mac OS X operating system. Although Mac OS X is relatively new, Objective-C and Cocoa are much older. Brad Cox invented Objective-C in the early 1980s to meld the popular and portable C language with the elegant Smalltalk language. In 1985, Steve Jobs founded NeXT, Inc., to create powerful, affordable workstations. NeXT chose Unix as its operating system and created NextSTEP, a powerful user interface toolkit developed in Objective-C. Despite its features and a small, loyal following, NextSTEP achieved little commercial success. When Apple acquired NeXT in 1996 (or was it the other way around ), NextSTEP was renamed Cocoa and brought to the wider audience of Macintosh programmers. Apple gives away its development tools including Cocoa for free, so any Mac programmer can take advantage of them. All you need is a bit of programming experience, basic knowledge of Objective-C, and the desire to dig in and learn stuff. You might wonder, If Objective-C and Cocoa were invented in the 80s in the days of Alf and The A-Team, not to mention stuffy old Unix aren t they old and moldy by now Absolutely not! Objective-C and Cocoa are the result of years of effort by a team of excellent programmers, and they have been continually updated and enhanced. Over time, Objective-C and Cocoa have evolved into an incredibly elegant and powerful set of tools. Objective-C is also the key to writing applications for the iPhone. So now, twenty-some years after NeXT adopted Objective-C, all the cool kids are using it.
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Objective-C is a superset of C. Objective-C begins with C, and then adds a couple of small but significant additions to the language. If you ve ever looked at C++ or Java, you may be surprised at how small Objective-C really is. We ll cover Objective-C s additions to C in detail in this book s chapters:
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2, Extensions to C, focuses on the basic features that Objective-C introduces. In 3, An Introduction to Object-Oriented Programming, we kick off the learning by showing you the basics of object-oriented programming. 4, Inheritance, describes how to create classes that gain the features of their parent classes. 5, Composition, discusses techniques for combining objects so they can work together. 6, Source File Organization, presents real-world strategies for creating your program s sources.
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CHAPTER 1: Hello
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7, More about Xcode, shows you some shortcuts and power-user features to help you get the most out of your programming day. We take a brief respite from Objective-C in 8, A Quick Tour of the Foundation Kit, to impress you with some of Cocoa s cool features using one of its two primary frameworks. You ll spend a lot of time in your Cocoa applications dealing in 9, Memory Management (sorry about that). 10, Object Initialization, is all about what happens when objects are born. 11, Properties, gives you the lowdown on Objective-C s new dot notation and an easier way to make object accessors. 12, Categories, describes the supercool Objective-C feature that lets you add your own methods to existing classes even those you didn t write. 13, Protocols, tells about a form of inheritance in Objective-C that allows classes to implement packaged sets of features. 14, Introduction to the Application Kit, gives you a taste of the gorgeous applications you can develop in Cocoa using its other primary framework. 15, File Loading and Saving, shows you how to save and retrieve your data. 16, Key-Value Coding, gives you ways to deal with your data indirectly. And finally, in 17, NSPredicate, we show you how to slice and dice your data.
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If you re coming from another language like Java or C++, or from another platform like Windows or Linux, you may want to check out Appendix A, Coming to Objective-C from Other Languages, which points out some of the mental hurdles you ll need to jump to embrace Objective-C.
Summary
Mac OS X programs are written in Objective-C, using technology from way back in the 1980s that has matured into a powerful set of tools. In this book, we ll start by assuming you know something about C programming and go from there. We hope you enjoy the ride!
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