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Figure 2 7. Adding a breakpoint
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You ll notice that the Build and Run button now reads Build and Debug, and the Breakpoints button is highlighted. The latter button toggles the breakpoint(s) on and off. OK, click on Build and Debug. The program runs as before, but stops at the breakpoint. Click on the Debug button in the Page button group. This shows you the Debugging window for your running application (see Figure 2 8).
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CHAPTER 2: Introducing the Xcode Workspace
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Figure 2 8. The Debugging window in your running application
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We re going to cover debugging in much more detail in 7, but for now you can see that the window shows a code editor, a panel displaying current variable values, and the console. The console shows the gdb (GNU Debugger) prompt. Now click on the Continue button in the toolbar. The application window which has been hiding behind the Workspace comes to the front, and the NSLog message appears in the console (Figure 2 9).
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CHAPTER 2: Introducing the Xcode Workspace
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Figure 2 9. The application after continuing past the breakpoint
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With strategic use of NSLog messages, the console can be an excellent place to follow the flow of execution of your application.
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The Favorites bar is a little like the bookmarks bar in a browser. It is yet another way for you to organize your work: simply drag any object that you want to be able to get to quickly onto the bar. Of course, you need to show it first: choose the View Layout Show Favorites Bar menu. To remove an item from the Favorites bar, just drag it off; I find this works most reliably if I just drag the item toward the toolbar, then release it and wait for the puff of smoke.
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Status Bar
You saw the Status bar earlier, as a place for Xcode to give you messages about the progress of a range of activities, and there isn t a great deal more to say about it. If you don t find the Status bar useful you can hide it using the View Layout Hide Status Bar menu.
CHAPTER 2: Introducing the Xcode Workspace
It s All Gone Horribly Wrong
Xcode is an incredibly rich and complex environment. It s easy to make changes, and consequently easy to make mistakes. Luckily, it s easy to reset the Xcode environment back to its defaults. If you need to restore the defaults, open up the Terminal and enter this command:
> defaults delete com.apple.Xcode > rm -rf ~/Library/Application\ Support/Xcode
This will delete the plist file for Xcode and put everything back to default settings. Bear in mind that, if you do so, this will remove all of your Xcode preferences, default layout choices, file history, toolbar settings, and so on (interestingly, bookmarks are not lost).
Xcode Workspace Preferences
To finish up this chapter, let s take a look at the Preferences window for Xcode. To get to the Xcode Preferences window, choose Xcode Preferences... or press , (that is, command and comma). The Preferences window has two parts. At the top is a scrolling toolbar of thirteen buttons, and for each of these there is a detail view below. This is quite unlike the Preferences windows for Apple s other software. It is also a very complex collection of settings, many of which you may never need to change, and so we re going to cover only the most important settings for now.
General
The General button is selected by default. The main thing to choose here is the layout, which you briefly used to look at the toolbar options. There are three layouts: All-In-One. This keeps all of your components in one window, with a Project page presented as three panels: Groups and Files list, Detail view, and Editor view. It also provides you with a page control in the toolbar that allows you to flip between the Project page and the Debugging page. You are still able to open an editor in a separate window by double-clicking on its name in a list. Condensed. This option gives you a simple view made up of a variation on the Groups and Files list. This list shows just the Source Groups by default though you can use the right-click Preferences popup menu to choose other items to display here. Unlike the Groups and Files display in the other layouts, however, the Condensed layout includes some detail information on the items (Build status, warnings, and errors by default, though a right-click on the header bar will allow you to change this). Editor and Debugger views open in separate windows.
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