Using Xcode in Objective-C

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Using Xcode
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access to another set of classes that will make your life easier. In particular, if you have problems accessing a method defined in the SDK, you can look in the appropriate class reference and see the framework that s required near the top of the reference. All you have to do to add a framework to Xcode is Ctrl-click the Frameworks folder in your Xcode side pane and choose Add > Existing Frameworks. Xcode will show you a long list of frameworks. When you choose one, it s automatically set up as a target when you compile. Your default frameworks are selected by the template that you choose to use when you create your project. For example, the Window-Based Application determines that you have access to the Core Graphics, Foundation, and UIKit frameworks at the start. Other templates may give access to other frameworks with no additional work required on your part.
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When you re creating a new program in Xcode, you always have the option to select among several templates, each of which gives you a different basis for your code. Besides a Window-Based Application, you can create a project as a View-Based Application, a Tab Bar Application, a Navigation-Based Application, a Utility Application, or an OpenGL ES Application. Most of these templates build in view controllers and give access to other functionality that you won t encounter for a couple of chapters. We give you a glance at them all now so you can see the possibilities that Xcode offers. Figure 3.5 shows how much different templates can vary from the Window-Based Application that you ve been using.
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Figure 3.5 By using the appropriate template, you can lay out a nav bar (left), a tab bar (middle), or a flipside function (right) before you start writing any code.
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Here s a bit more information about each of the six templates: A Window-Based Application, as you ve seen, is entirely minimalist. You need to create a default UIView for your application before you can do anything. That s what you ve used so far. A View-Based Application has a hair more functionality. It includes a basic view controller that allows you to autorotate content. You ll use it in chapter 5 (and most of the time thereafter). A Tab Bar Application creates a tab bar along the bottom that allows you to switch between multiple views. The template does this by creating a tab bar controller and then defining what each of its views looks like. You ll use it in chapter 7. A Navigation-Based Application sets you up with a navigation controller, a nav bar along the top, and a table view in the middle of the page so you can easily build hierarchical applications. You ll also use it in chapter 7. A Utility Application defines a flip-side controller that has two pages, the first with an info button that allows you to call up the second page. This is the last view controller we ll explore in chapter 7. An OpenGL ES Application is another minimalistic application. Its main difference from the Window-Based Application is that it includes GL frameworks, sends the glView messages to get it started, and otherwise sets certain GL properties. We won t get to GL until chapter 13, and even then we ll only touch on it lightly.
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Before we leave Xcode behind, let s explore a few of the great features it includes to make your coding easier. You can investigate these features in any of the projects that you ve written so far.
EDITING WINDOW
You see a file s code in an editing window whenever you single-click a .h or .m file. If this window isn t big enough, you can instead double-click to get a brand-new window. The editing window includes a number of nice features: Autocompletion Whenever you write code in the editing window, Xcode tries to autocomplete words for you. This includes framework methods, your own methods, and even variable names. For methods, it goes a step further and shows you the standard arguments you should pass. If you don t like what you see, keep typing; but if you do like it, press the Tab key, and the rest will be inserted. We ve torn out our hair way too many times due to misbehaving code that turned out to be the result of a typo. Xcode s autocompletion can easily resolve that problem in advance. Class controls Ctrl-click the class name in an @implementation line, and you ll see a Refactor option. Select this option to not only change the name of your class in all files but also modify the names of the files for that class. Also see variable controls for a similar feature.
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