Location of the Frameworks in Objective-C

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Location of the Frameworks
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This is probably only of academic interest to you, but you may like to know where the frameworks are kept on your Mac and how they fit into your Mac environment. The main Apple-supplied frameworks are in /System/Library/Frameworks. Look in this folder and you will see folders for Foundation.framework, AppKit.framework, CoreData.framework, and many others. Let s take a quick look at NSObject. Bear in mind that you won t see the source code for NSObject, or for that matter the compiled framework, but simply the header file. Find and open Foundation.framework, then open the alias Headers. You will see all of the classes within the Foundation framework, and, if you want to know the properties and methods
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CHAPTER 5: Frameworks in Xcode
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of one of these, open it up in a text editor (don t be tempted to try to change it, of course). This is not the best way to find the properties and methods of a Cocoa class, naturally. There is excellent documentation (which you will be exploring in 8). The point of this exercise is simply to familiarize yourself with the frameworks and dispel some of the mystery that may surround them.
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Apart from those supplied by Apple, your Mac may well have other frameworks that contain libraries of code specific to third party products. You can find these in /Library/Frameworks. For example, my computer has additional frameworks for MacRuby, OpenBase, and several other products. In the course of your development work you may want to bundle together any code libraries that you have built and need to reuse into your own frameworks. This is perfectly feasible, but is way beyond the scope of this book. Finally, there are frameworks specifically associated with Xcode Developer Tools, in /Developer/Library/PrivateFrameworks and the public developer frameworks in /Developer/Library/Frameworks.
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Few developers ever need more than basic knowledge of the background of frameworks. The really useful information is how to use them in applications. However, you may want to understand in greater depth how the frameworks are designed. Your best bet is to head over to the documentation. The Cocoa Fundamentals Guide (http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals) is a great source of really detailed information about the Cocoa frameworks.
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One way to use Cocoa frameworks in your applications is by choosing the appropriate Cocoa template when you create a project. However, you can also choose to bring a particular framework into your project to take advantage of its features. For the rest of this chapter, you are going to be creating a variety of applications that will use Cocoa frameworks to create capable, feature-rich software with a minimum of coding. Along the way you will try different ways to load and use Cocoa frameworks.
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The WebKit Framework Create Your Own Web Browser
WebKit is the framework that underlies Safari, Google Chrome, and various other web client applications. It is an open source framework providing a highly capable web
CHAPTER 5: Frameworks in Xcode
browser engine. The implementation in Cocoa allows you to readily embed a web browser view into your applications. You are going to create a WebKit-based web browser from scratch. The really striking feature of this project is that you will not need to write a single line of code. Create a new Xcode project and choose the Cocoa application template; don t select the Document-based application, Core Data, or Spotlight Importer options. Call your project Browser Pal . When the project workspace window comes up, take a look at the Frameworks group (in the Groups & Files list). You can see the frameworks available to this project: AppKit, Cocoa, CoreData, and Foundation (see Figure 5 1).
Figure 5 1. Browser Pal project workspace showing the default frameworks
You need to add the WebKit framework as a first step. Open up the yellow Frameworks folder icon, right-click the Other Frameworks folder and, from the contextual menu, choose Add Existing Frameworks.... Use the Framework picker to choose WebKit.framework. There are a lot of available items in this picker, so you can use the popup menu at the top to filter just the frameworks. When you have selected WebKit.framework, click on Add and you will see the workspace with the new framework in place. Now it s time to move to Interface Builder. Double-click on MainMenu.xib and you will see the main user interface window.
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