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Part 3 Learning SDK fundamentals
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eb development is just one way to program for the iPhone. In part 3 of this book we cover the fundamentals of another sort of iPhone development: SDK programming. The SDK is Apple s Software Development Kit, an object-oriented set of frameworks that help you write great iPhone programs. Over the next several chapters we ll introduce all of its basics, starting with how to use Objective-C and the iPhone OS (chapter 10) and how the SDK s two most important programs, Xcode (chapter 11) and Interface Builder (chapter 12), work. From there we ll move on to some of the most important concepts in SDK programming, including view controllers (chapters 13 and 15) and events (chapter 14). The SDK is a large topic, and these chapters represent the lightest introduction to it: we re going to delve more in depth into many elements of the SDK toolkit in part 4 of this book.
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This chapter covers
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Learning about Apple s SDK package Understanding Objective-C Looking at the iPhone OS
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Over the next several chapters we re going to dig into the other side of iPhone development, where you ll be programming native applications using Apple s own toolkit. As we discussed back in chapter 2, there are a number of reasons that the SDK is better than web development, just as the opposite is the case, depending on your particular needs. In this chapter, we assume you have a good understanding of a rigorous programming language (like C), that you know the basic concepts behind objectoriented programming (OOP), and that you understand what the MVC architectural model is. If you aren t familiar with any of these topics, just jump back to the previous chapter, where we give each of these topics an overview. With that said, we re now ready to move into the world of SDK development. We ll download the SDK first thing so that we can see what it consists of, but then
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we re going to take a step back to examine the programming language and frameworks that you ll be using when you program with the SDK.
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10.1 Getting ready for the SDK
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The iPhone SDK (Software Development Kit) is a suite of programs available in one gargantuan (over 1GB) download from Apple. It ll give you the tools you need to program (Xcode), debug (Instruments), and test (iPhone Simulator) your iPhone code. Note that you must have an Apple Macintosh running Mac OS X 10.5.3 or higher to use the SDK.
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10.1.1 Installing the SDK To obtain the SDK, download it from Apple s iPhone Dev Center, which at time of this writing is accessible at http://developer.apple.com/iphone/. You ll need to register as an iPhone Developer in order to get here, though it s a fairly painless process. Note that this is also the site you can use to access Apple documents, as we ve mentioned earlier. The Apple docs and the SDK
We ve already highlighted the fact that the Apple Developer Connection (ADC) provides access to numerous programming documents. For your SDK needs, you ll want to visit http://developer.apple.com/iphone/, which contains a few introductory papers, of which we think the best are iPhone OS Overview and Learning ObjectiveC: A Primer, plus the complete class and protocol references for the SDK. As we ll discuss in the next chapter, you can also access all of these docs from inside Xcode. We usually find Xcode a better interface because it allows you to click through from your source code to your local documents. Nonetheless, the website is a great source of information when you don t have Xcode handy. As with the web chapters of this book, we ve been constantly aware of Apple s documents while writing this part of the book, and we ve done our best to ensure that what we include complements Apple s information. We ll continue to provide you with the introductions to the topics and to point you toward the references when there s need for in-depth information.
Once you ve downloaded the SDK, you ll find that it leaves a disk image sitting on your hard drive. You just need to double-click it and then click on iphone SDK in the folder that pops up, as shown in figure 10.1. This will bring you through the entire install process, which will probably take 20 40 minutes. You ll also get a few licensing agreements that you need to sign off on, including the iPhone Licensing Agreement, which lists some restrictions on what you ll be able to build for the iPhone.
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