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This chapter covers
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The two types of iPhone development Ways to program for the iPhone Integrated project development
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There are two ways you can develop for the iPhone. One approach is to write web pages for mobile Safari, using HTML, CSS, JavaScript, and your favorite dynamic language. The other is to write native applications to run directly on the iPhone, using Objective-C and the iPhone SDK. We strongly believe that each programming method has its own place, and that you should always ensure you re using the correct one before you get started with any iPhone project.
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One of the things that might surprise programmers coming to the iPhone for the first time is the fact that web development and SDK programming can produce similar user-level experiences and support much of the same functionality. We ve
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highlighted this in figure 2.1, which kicks off our discussion of the fact that web development and SDK programming are both reasonable alternatives when creating applications for the iPhone. Figure 2.1 depicts what iPhone developers call a utility, a two-page iPhone application that contains the actual application on the front page and setup information on the back page. Within the illustration, we ve included a snippet of the code that allows the utility to flip between the pages when the info button is pushed. It s done in
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Figure 2.1 Though not identical, web programming (left) and SDK development (right) can produce similar output with similar underlying programming models.
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JavaScript in the web example and in Objective-C in the SDK example. Each one produces an attractive rotating animation when the active screen is changed. We ll explain more about how the code for each programming style works in the chapters ahead, but we wanted to give you a preview now. There s a further similarity between the two programs: each one features on its front page an editable text view. This view can be used to display text, and can be edited using the iPhone s built-in keyboard. We ll be talking a lot more about the similarities between the programming styles throughout this book. For now, we mainly want to highlight that neither style is a poor cousin: each has considerable functionality and can be used to create attractive UIs quickly and simply.
A central philosophy: the continuum of programming
Although we think that both styles of iPhone programming are useful, we re well aware that many of you are coming to this book from one of two directions. Either you re a web developer and want to learn how to optimize your web pages for viewing on the iPhone, or you re a programmer and you want to extend your C (or C++ or C# or J2ME) programming experience to the iPhone. We welcome you all, and we re certain that in this book you ll find a great introduction to your style of programming on the iPhone. Even if you ve never programmed before but are simply intrigued by this new iDevice that you have, you ll be able to follow this book right through its introductory tutorials. Whichever route you ve taken here, we encourage you to read the entire book, because we believe that by understanding and using the entire continuum of iPhone programming you ll literally get twice as much out of the experience. For the web developer, we re going to tell you everything you need to know about the specifics of iPhone programming, including digging into some web features that you re probably not familiar with, such as the newest WebKit features, iUI, and Canvas. We hope you ll keep reading from there, as our material on the SDK is all quite introductory, and even if you ve never worked with a compiled programming language, you can use this book to move up to SDK programming. 9 is the foundation of this transition. It ll provide you with the basis of how a compiled programming language differs from the PHP, Perl, or Ruby on Rails that you might be familiar with. Starting from there, you should be able to learn the same lessons as a more experienced C programmer when we dive into the SDK itself. For the SDK programmer, we re going to provide you with a complete introduction to all of the SDK s coolest features, including all of the unique iPhone features that we ve already touched on, such as its GPS, its accelerometers, and its unique input device. However, we hope you won t consider SDK programming the be-all, end-all of iPhone software. We feel there are genuinely places where web development is a better choice. We ll argue the reasons that you might select web development over SDK right here, in this chapter. Even if you opt not to do any web development, we invite you to
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