Xcode Fundamentals in Objective-C

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Xcode Fundamentals
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Xcode is Apple s Mac OS X integrated development environment (IDE) It comes packaged with the OS X install DVDs as a separate install You can also download it from Apple s Developer Connection As of this book s writing, Xcode is bundled with the iPhone SDK If you have not already downloaded and installed the iPhone SDK, you should do so now You can find Xcode in the /Developer/Applications folder You should add Xcode to your computer s Dock so that you can access it easily Figure 1-11 illustrates Xcode s Project window
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Objective-C for iPhone Developers: A Beginner s Guide
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Figure 1-11
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Xcode s Project window (Default layout)
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You use the toolbar to select what target you will compile to For instance, in this book you will only use the iPhone simulator in debug mode, and so you will always choose Simulator 30 | Debug After you ve chosen it once, unless you change it, Xcode remembers your choice The Groups & Files list contains the project s source files, resources such as images, and XIB files The gutter is where you will add something called breakpoints in later chapters And the Content pane is the editor, or where you will edit source files For more comprehensive information on the editor, see the document Xcode Workspace Guide, referenced later in this chapter Before using Xcode, you should configure it so that it matches your work style Figure 1-11 illustrates the project window displayed using what is called the Default layout This layout is not the layout you will use in this book s remaining Try This examples Instead, you will use what is called the All-In-One layout In the next Try This example you configure Xcode to use the All-In-One layout
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Exploring the iPhone SDK and Basic Programming
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Configuring Xcode s Display
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There are three ways you might configure Xcode s layout: Default, Condensed, and AllIn-One In the book iPhone SDK Programming: A Beginner s Guide, I use the Default layout However, in this book, since you will be using the debugger console more extensively, you should use the All-In-One layout
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Try This
Assigning Xcode the All-In-One Layout
1 Open Xcode From the menu, select Xcode | Preferences to display the preferences
dialog
2 Select General and then All-In-One from the Layout drop-down Ensure the check
boxes are all selected (Figure 1-12)
3 Click Apply 4 Select Text Editing and ensure the Show Gutter check box is selected (Figure 1-13) 5 Click Apply and then OK 6 Open the HelloWorld project and Xcode should now show two small buttons at its
upper left (Figure 1-14)
Figure 1-12
Selecting All-In-One for Xcode s layout
(continued)
Objective-C for iPhone Developers: A Beginner s Guide
Figure 1-13
Ensuring Xcode shows the gutter
Figure 1-14 The edit and debug buttons
1:
Exploring the iPhone SDK and Basic Programming
7 Click Build And Debug to run the application in debug mode If the button says Build
and Run, then select Build | Build and Debug from XCode s menu Notice Xcode s appearance changed (Figure 1-15) Notice the button with the spray can image is depressed
8 Click the other button to the left and the editor pane is displayed Toggle between the
two buttons a few times
9 Quit the application by clicking the red Tasks button Notice that the iPhone Simulator
remains running
10 Select the simulator, and then end it by selecting iPhone Simulator | Quit iPhone
Simulator from the simulator s menu
Figure 1-15
Xcode running in debug mode
(continued)
Objective-C for iPhone Developers: A Beginner s Guide
Exploring Xcode Further
Apple has good documentation on using Xcode You should read that documentation Apple s Xcode Workspace Guide is a comprehensive Xcode document that you can read online or download You do not need to read it fully I never have but you should skim it for things that can help you use Xcode more productively This document has many tidbits you might miss that make working with Xcode easier and quicker For instance, the document covers the keyboard shortcuts, how to reset Xcode, and how to take a snapshot of your project The document is worth reviewing
You can take a snapshot of your work by selecting File | Make Snapshot This saves your project s current state should you require reverting your project back to a previous state I use this feature religiously; many times I have made a complete mess of my project and needed to restore it to a known, more stable state Should you need to restore, you select File | Snapshots from Xcode s menu to display the Snapshots dialog You can then select the snapshot you wish to revert to
Summary
If new to programming, you found much material to digest Do not be concerned if you do not understand all the concepts presented in this chapter You should understand what a header file and a source file are and how you create them You should also understand how to create a simple Xcode iPhone project from a template, compile it, and run it And you should understand that mainm contains a main method that is the starting point for all iPhone applications If you do not fully understand pointers, that is okay, as you will learn more about them in the next couple chapters For now, just remember that a pointer points to a variable s location and not the variable s value In future chapters, almost every topic presented in this chapter will be covered in more depth In the next chapter you explore primitive data types
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