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Figure 2 5. Information available in the Detail view
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CHAPTER 2: Introducing the Xcode Workspace
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Editor View
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The Editor view offers quick access to any editable files in your project. This means that when you select a file in the Groups and Files list, or in the Detail view, its contents will be shown in the Editor view. Xcode offers you two overall ways to edit your code: within the main Project Workspace window or in a separate window. To see your code in a separate window, just doubleclick the filename in the Detail view. Whether you choose single or separate window editing, what you see here and how you edit it depends on the format of the file you have selected. To see how this works, choose the Project Structure top-level folder in the Groups and Files list (its name will be the same as the name of your project in this case, My First Project ). The contents of this folder will show in the Detail view. If you select the first few items in the Detail view (various .framework files), you won t see any change in the Editor view because these files are not editable. In fact, the only editable files in this list are My_First_ProjectAppDelegate.h, My_First_ProjectAppDelegate.m, Info.plist, InfoPlist.Strings (English), Simple application_Prefix.pch, and main.m. Selecting Info.plist will show you a tabulated view of the plist file for this project. This is essentially the same view you would see if you opened the file in the Property List Editor, but the Editor view is a convenient way to get access to such files. You ll learn much more about plist files and the Property List Editor in 14, but fundamentally they are configuration files holding key-value pairs and stored in a binary format (exactly why Apple made this change escapes me; until recently plist files were simple textbased XML files). The tabular display allows you to modify existing rows, usually by selecting from dropdown lists, or to add new ones. Below the plist file entry you will see InfoPlist.Strings (English). On choosing this, the Editor view shows a text file (empty for now apart from a comment). This file is used to hold localized versions of string properties if you are creating applications for use in different languages. The most interesting files though are My_First_ProjectAppDelegate.h, My_First_ProjectAppDelegate.m, and main.m. Click on one of these and, at long last, you can see some code!
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YOUR APPLICATION S ENTRYPOINT MAIN.M
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The file main.m is created as part of every Xcode project, and while this book is not about the Objective-C language or writing code, it is worth a quick look at what this file is doing, as it will inform the rest of your software development. If you have done any C programming, the structure of this file will hold few surprises. It is the formal entry point of the application, the main function. Having imported the Cocoa header files it simply instantiates a Cocoa application object and then quits. From this small acorn of a file, the enormous oak of your application springs forth. In later chapters you will see exactly how the application progresses from here.
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CHAPTER 2: Introducing the Xcode Workspace
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Like most code development environments, Xcode offers color-coded editing, with keywords and symbols highlighted for ease of identification. You have complete control over the color-coding through the Preferences window (see the section on Xcode Workspace preferences later in this chapter). At the top of the Editor view is a slim toolbar that allows you quick access to specific files, and functions within files, through a number of popup and dropdown lists. You can also use this to swap back and forth between file counterparts. Each .m file has a header or .h counterpart file. Clicking the little gray-on-white square icon at the right of the editor toolbar toggles the editor between the .h and .m files (if you have used the BBEdit code editor, this feature will be familiar to you). The Editor toolbar also proves to be a really quick way to navigate your project. When a class file gets big, you can simply click on the functions popup and there will be a list of all of your functions. You can even add your own layer of organization to this popup list by using the Pragma mark option in your code. If you put a string like the following into your class code in the Editor view, then all of the methods below that point in your code window will show in the popup list as children of My custom methods :
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