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You can design your own modal view controllers for when you want to have users make a choice before you return them to the regular program. More commonly, you ll use picker controllers that are intended to be run as modal view controllers. In chapter 10, you ll meet the Address Book UI people picker (as well as some related controllers that run inside a navigator), and in chapter 11 you ll meet the image picker.
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At this point, we ve finished with what we consider the basic introduction to the SDK. Because this is an introductory SDK book, our main goal has been to show you all the fundamentals before we set you loose in the wilds of iPhone and iPad programming, so you have the building blocks you need when you begin programming on your own. Let s briefly review: The SDK is built on top of Objective-C and is supported by a large set of frameworks called the iPhone OS. (See chapter 2.) Programming can be done in either Xcode or Interface Builder, supporting two powerful ways to create objects. (See chapters 3 and 4.) Basic view controllers take the controller role of the MVC model and allow you to administer your views in a rational way. (See chapter 5.) Events provide low-level methods for seeing what a user is doing, whereas actions provide more sophisticated connections to buttons, sliders, text fields, and other tools. (See chapter 6.) Advanced view controllers provide you with a variety of ways to navigate among pages. (See chapter 7.) Although we ve completed our introduction to the iPhone SDK, we re not finished yet. Our next stop is an in-depth look at the many ways to input data into an application.
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In the preceding chapters, we offered a tutorial on the most important features of the SDK: we outlined Objective-C and the iPhone OS; we explored the two main tools, Xcode and Interface Builder; we examined view controllers of all types; and we looked at the standard event and action models for the iPhone and iPad. In the process, we tried to provide the strong foundation that you need to do any type of iPhone OS programming. Armed with that knowledge, and with the extensive documentation available online (or as part of Xcode), you should be able to start programming right away. But we also want to offer you some additional information about many of the SDK s best features. In the coming chapters, we ll touch on some of the major categories of SDK tools and show you how to use them.
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Data: actions, preferences, and files
We ll expand on the sample programs a bit. Having completed the introduction to the SDK, we can take advantage of your knowledge of Objective-C to incorporate at least one in-depth example in each upcoming chapter; our intent is to show how different objects can work together to create a more complex Objective-C project. We can t give you full iPhone App Store programs, because of the breadth of what we re covering here, but expect to see some code examples that are more than a page long and that typically include some off-topic elements. This chapter will kick off our look at the SDK toolkit with a discussion of data, which will describe many of the ways you can deal with information generally (and text specifically). We ve broken this into a couple of broad categories. First, we ll look at the ways users can input data into your program, focusing on actions and preferences. Second, we ll examine ways that you can store and retrieve internal data using files.
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