Mac OS X Leopard - ARCAism

SCM
If you’re using version control in Xcode, any file that has been changed will be added to the SCM
results details pane, as well as the SCM smart group. Items in the SCM smart group have version
control commands in their contextual menu, which makes it easy to commit, revert, or diff a
single file.
The SCM smart group’s icon turns into a progress indicator during version control operations,
so you can keep an eye on how your commit is going while getting ready to break things
again.
Project Symbols
Unlike the other smart groups, Project Symbols doesn’t have a disclosure triangle revealing a
hierarchy of files. Rather, it’s just there so you can select it and bring up its details panel. Doing
so yields a list of every symbol, which is to say, every method, function, ivar, struct, global, typedef,
protocol, property, and macro, as well as anything defined in a Core Data model or Interface
Builder nib.
Why would you need a gigantic list of every symbol in the project? Who knows! But when
the day comes, you’ll probably be glad it’s there.
Implementation Files/NIB Files
Aside from the built-in smart groups, you can create your own. Although they are functional and
potentially useful, the Implementation Files and NIB Files smart groups are really samples of the
kinds of things you could do. To create a smart group, select an option from the Project menu’s
New Smart Group submenu.
To edit an existing smart group, select Get Info from its contextual menu, or select it in the
sidebar and type Cmd+I. Aside from defining a name, filter, and scope for the group, you can
also set its icon. Regardless of whether that’s useful, it’s pretty cool.
Breakpoints
CHAPTER 25 MAC OS X DEVELOPMENT: THE TOOLS 457
While running your program in the debugger, you may want to stop at a certain line of code to
examine the values of variables, test some method calls, or just follow along line-by-line to see
what’s happening. To mark lines for the debugger to stop, or break, you set breakpoints. Breakpoints
are also handy placeholders in their own right. To help you examine or jump to a certain
breakpoint, they are all listed under the Breakpoints smart group.
TIP Xcode also has a Favorites bar, which is similar to the Bookmarks bar in Safari. You can
reveal the Favorites bar by selecting Show Favorites Bar from the Layout submenu of the View
menu. Dragging files, groups, or smart groups to the Favorites bar will add them. Clicking an
item in the Favorites bar will select it in the Groups & Files sidebar.
One thing I’ve noticed about Apple applications: they always include amazing templates.
You can fire up anything in iLife or iWork and you already have a fully functional, if somewhat
boring, web site, movie, song, DVD, presentation, or document. Xcode is the exact same way.
Without typing anything, you’ve already started with a fully functional document-based application.
To see this for yourself, build and run your project by selecting Build and Run from the
Build menu, typing Cmd+R, or clicking the hammer icon on the toolbar. In short order, you’ll see
a generic document, as seen in Figure 25-8.
If you’re following along at home, you’ll notice one difference between your application and
the one in Figure 25-8. Namely, yours says “Your document contents here,” and the one in the
figure says “Hello World!” You can examine the source code all you want, but you’re not going
to find it.