progress bar code in vb net 2010 2: Introducing the Xcode Workspace in Objective-C

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CHAPTER 2: Introducing the Xcode Workspace
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Figure 2 2. Creating a new project
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Figure 2 3. Welcome to the Xcode Workspace user interface.
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CHAPTER 2: Introducing the Xcode Workspace
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There is an awful lot going on here, and in truth there are some parts of this sophisticated working environment that you won t need to visit for some time yet. However, you are reading this book because you want to create great software, and it s worth just showing one great feature of Xcode now: your application, running. Take a look at the toolbar and you will see a big green button with the label Build and Run. Click that button. That s right you have a working application. Granted, it doesn t actually do anything interesting yet, but it has a resizable window, an About box, and placeholders for all of the main menus you are likely to have to use in your development work (see Figure 2 4).
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Figure 2 4. Xcode projects compile and run out of the box.
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It s worth just noting that you have some useful information available as your application compiles and runs. The Status bar at the bottom of the Xcode Project Workspace window shows the current compilation task and then a Debugger message saying GDB: Running confirming that the program is indeed running. To the right, the status bar shows a progress indicator (the whole process should take just a few seconds for this application, but can take a lot longer once your project gets more complex) and then an indication of whether the project has compiled successfully. There s nothing more to see with this application just yet, so quit. Since this is a complete Mac OS X application already, you can use the normal File Quit or Q methods. However, you have another option. Because you built it from within Xcode in debug mode (lots more on this later), you can stop the application from the Xcode window using the big red Tasks button. Try this now. You will see the Status bar shows the message Debugging terminated. It s time to take a closer look at the Project Workspace. Let s start with the major items of interest and the things you need to know right now.
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CHAPTER 2: Introducing the Xcode Workspace
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The Xcode Workspace Working Environment
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The default layout for the Xcode Workspace (called the Project Window) has a simple three panel display (List, Detail, and Document) with a toolbar. If you have used Apple Mail or iTunes, then this interface will be familiar. I m going to cover each of the major parts of the interface briefly, but I will come back to some of them in more depth later. Xcode offers a number of different layouts, ranging from All-In-One (as the name suggests, all of the components are presented in one window) to Condensed (where a subset of the main features appear in separate windows). You can change between these layouts, but only when you have closed all open projects. Since you have only just created a project, it seems a little churlish to close it again, so let s park this topic for the moment (there is a section on Preferences later in this chapter if you want to know more right now). Each layout has its own advantages and, as usual, it comes down to personal choice. When you have settled on the one you like, you can make it the default by choosing the Window Defaults... menu.
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Groups & Files List
The Groups & Files list provides an overview list of all components and assets in your software project. At the top of the list is your project name, containing source groups (also called the Project Structure) providing convenient storage locations for the classes and other components for your project. You are not limited to these, however; feel free to create groups that make sense for your working style and to move your source files around between groups. For example, you might want to have a custom classes group within your project. You can simply right-click (or Control-click) your project name in the list and choose Add New Group from the popup menu. Source groups contain your working code .h header and .m class files if you are developing in Objective-C and you will usually keep them in the Classes and Other Sources folder. Under the source groups are a collection of smart groups. Most of these are empty when you start your project and content appears as it develops and grows. As a new developer (and maybe later on, too), you are not likely to need to explore the content of the Targets and Executables groups, which essentially contain instructions and other information related to the building of your application. Similarly you may not want immediately to explore the Project Symbols group, as this is a more advanced topic. You can hide any unwanted groups; just right-click on any group in the list (or use Control-click), choose Preferences, and uncheck the group you want to hide. You will see a dialog asking you to confirm deletion, but don t worry you will be able to put the group back in the list simply by repeating this process and checking the group again. I tend to hide the Targets, Executables, and Project Symbols groups simply because they don t hold much meaningful information for me as a relatively novice developer. Finally, you can move groups around in the list to suit your preferences just drag a group to a new location in the list.
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