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11.4.3 Xcode tips and tricks
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Before we leave Xcode behind, let s explore a few of the great features that it includes to make your coding easier. You can investigate these features in any of the projects that we ve written so far.
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EDITING WINDOW
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You ll see a file s code in an editing window whenever you single-click on an .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, among them:
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Autocompletion Whenever you write code in the editing window, Xcode will try to autocomplete words for you. This will include 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, just keep typing, but if you do, hit 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 results of a typo. Xcode s autocompletion can easily resolve that problem in advance. Class controls Ctrl-click on 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 to modify the names of the files for that class as well. Also see variable controls for a similar feature. Code folding As with many modern IDE environments, you can fold your code, making it easier to read by hiding the contents of functions and/or comments. You can easily fold a function by clicking in the narrow gray bar to the left of your code. The functionality is also available in the View menu or by Ctrlclicking inside the editing window.
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Summary
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Doc lookup Option-double-click any standard structure, method, or property, and you ll see information on it in an Xcode Workspace Guide window (which we discuss more in a moment). We think this is the best feature of the IDE, because it makes programming with otherwise unknown frameworks very simple. Superclass lookup At the top of your editing window is a menu labeled C. You can use this window to look up the superclass of your current object. Doing so will lead you to the superclass s header file, which will reveal its properties and methods. Variable controls Click on a variable and you ll see a gray underline materialize; shortly after that you ll see a triangle appear to the right, allowing you to pull down a menu. From there you can jump straight to the definition of the variable or Edit All in Scope, which allows you to change the name of a variable within your current scope. Also see class controls for a similar feature.
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ORGANIZER
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You call up this window by choosing Window > Organizer. You can store references to a number of projects here, linking them in from the + menu that appears at the bottom of the window. In addition to easily accessing your projects, you can compile them in a variety of configurations and even see debugging logs and crash logs related to them.
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XCODE WORKSPACE GUIDE
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Open this window by selecting Help > Xcode Workspace Guide. Here you can access local copies of the documents that are found at developer.apple.com. To keep your copies of the docs up to date, you should subscribe to individual doc sets (such as iPhone OS 2.1 ). This will download the newest copies of the docs whenever they become available.
11.5 Summary
Xcode is ultimately the basis of all SDK programming. It s where you ll write the actual code that allows you to create, manipulate, and destroy objects. As we ve seen in this chapter, it s quite easy to use Xcode to do pretty sophisticated things. This is in part due to Objective-C s elegant methods of messaging and in part due to the iPhone OS s massively library of classes. However, there s another way to do things. Basic objects can also be created graphically, using Interface Builder. It allows you to lay out objects using a graphical UI that makes their arrangement a lot easier. That s going to be the basis of our next chapter, when we delve into the other side of SDK programming.
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