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Part 4 Programming with the SDK Toolkit
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rogramming the iPhone can go well beyond the fundamentals that you learned in part 3 of this book. There are numerous frameworks that can give you access to complex, preprogrammed functionality. Part 4 of this book will highlight some of the most important possibilities. These include accessing data, such as text inputs, preferences, files, databases, and the Address Book (chapter 16); using positioning technologies, including the accelerometers and the GPS (chapter 17); working with media, such as images, movies, and sounds (chapter 18); drawing graphics with Quartz, Core Animation, and OpenGL (chapter 19); and connecting to the internet using URLs, web views, XML, POSTs, and social web technologies (chapter 20).
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Data: actions, preferences, files, SQLite, and addresses
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This chapter covers
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Accepting user input through controls Allowing user choice through preferences Accessing and creating files Using the SQLite library Manipulating the Address Book
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In part 3 of this book, 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. In the process, we tried to provide the strong foundation that you need to do any type of iPhone 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.
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But we also want to offer you some additional information on many of the SDK s best features that s the purpose of the fourth and final part of this book. In these five chapters, we re going to touch upon five major categories of SDK tools and show you how to use them. In the process, we re going to go over some ground covered by Apple in its own documentation for each of these tools. As usual, we re going to add value by approaching things in a tutorial manner and by offering specific examples of how each of the tools can be used in a real program. We ll also be expanding on our sample programs a bit. Having completed the introduction to SDK, we can take advantage of your knowledge of Objective-C to incorporate at least one in-depth example in each 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 which 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 few 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, including using files and the built-in SQL database. In our long example for this chapter, you ll build table views from SQLite data. Third, we ll discuss the Address Book a comprehensive iPhone system that allows for the simple input and retrieval of contact information that can be shared among multiple programs.
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16.1 Accepting user actions
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The simplest way to accept new data from a user is through UIControls, a topic that we covered in some depth in the latter half of chapter 14 and that we re looking at again here for completeness sake. Table 16.1 includes some notes on the controls that you can use to accept user data.
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Table 16.1 Various controls allow you to accept user input, most using simple interfaces. Summary Offers simple functionality when the user clicks a button. See section 14.5 for an example. A pure navigation object that allows users to move between multiple pages using a trio of dots. Not a UIControl object, but allows the user to select from a number of items in a slot machine selection. It includes the subclass UIDatePicker.
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