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To create the Mac app in this tutorial, you need Xcode 4.4 or later. Xcode is Apple’s integrated development environment (or IDE) for both OS X and iOS development.

Usage note: This tutorial lists the steps that are required to complete a task in a disclosable area that is defined by two horizontal blue lines and labeled with a blue dot and a phrase that describes the task, such as “To create a new project…” To reveal the steps in a task area, click inside the blue lines.

The desktop version uses the blue dot to notify you about new videos, new live streams, new community posts, and more whereas the mobile version only uses the blue dot to inform you about new videos. If you are seeing a blue dot but no new video, then try checking for new live streams or community posts.

Why is there a blue dot next to the apps on my iPad home screen? You may have noticed some apps have a blue dot next to them since you've upgraded to.
Try going to the Wi-Fi menu in Settings, tap on the blue circle to the right of the name of your Wi-Fi network, and tap Forget this Network. The enter your password and re-join it, and see if it will reconnect automatically next time.

When you complete the steps in a task, you can leave the task area open or you can close it by clicking the line with the blue dot and the descriptive phrase. Dmg vs pkg. (Clicking elsewhere in an open task area does not close it, so you can copy code from a step without closing the task.)

Create and Test a New Project

To get started developing your app, you create a new Xcode project.

Launch Xcode (located in the Applications folder).
If you’ve never created or opened a project in Xcode before, you should see a Welcome to Xcode window similar to this:
If you’ve created or opened a project in Xcode before, you might see a project window instead of the Welcome to Xcode window.
In the Welcome to Xcode window, click “Create a new Xcode project” (or choose File > New > Project).
Xcode opens a new window and displays a dialog in which you choose a template. Xcode includes several built-in app templates that you can use to develop common styles of Mac apps. Johnnie taylor soul heaven.
In the OS X section to the left of the dialog, select Application.
In the main area of the dialog, select Cocoa Application and click Next.
A new dialog appears that prompts you to name your app and choose additional options for your project.
- In the Product Name field, type TrackMix.
- In the Company Identifier field, type the identifier for your company, or com.MyCompany.
- In the App Store Category pop-up, choose None.
Note: Xcode uses the product name you entered to name your project and the app. To keep things simple, this tutorial assumes that you named your product TrackMix and did not specify a class prefix value. (The prefix is used to create unique class names for your app that won’t conflict with classes in other frameworks.) The organization name property that appears in this dialog is not used in this tutorial.
Make sure that the Use Automatic Reference Counting option is selected and that the Create Document-Based Application (appears above Document Extension), Use Core Data, and Include Unit Tests options are unselected.
Another dialog appears that allows you to specify where to save your project.
Specify a location for your project (make sure that the Source Control option is unselected) and then click Create.
Xcode opens your new project in a window (called the workspace window), which should look similar to this:

Take a few moments to familiarize yourself with the workspace window that Xcode opens for you. You’ll use the buttons and areas identified in the window below throughout the rest of this tutorial.

If the utilities area in your workspace window is already open (as it is in the window shown above), you can close it for now because you won’t need it until later in the tutorial. The rightmost View button controls the utilities area. When the utilities area is visible, the button looks like this:

If necessary, click the rightmost View button to close the utilities area.

Even though you haven’t yet written any code, you can build and run your app in Xcode.

Click the Run button in the Xcode toolbar (or choose Product > Run).
If a dialog appears asking whether Xcode should enable developer mode on this Mac, click Disable.
Xcode should build your project and launch the app. When your app starts up, it should have a standard menu bar and display a single window.
You can move and resize the window. However, if you close the window, there is no way to get it back. You should also find that menus display when you click them, and if you choose TrackMix > About TrackMix, an About window is displayed.
Quit the app by choosing TrackMix > Quit TrackMix.
Don’t mistakenly choose the Quit command in Xcode, or you’ll quit Xcode. You can also click the Stop button in Xcode.

Right now, your app is not very interesting: it simply displays a blank window. To understand where the blank window comes from, you need to learn about the objects in your code and how they work together to start the app.

Find Out How an App Launches

Because you based your project on an Xcode template, much of the basic app environment is automatically set up when you run the app. For example, Xcode creates an app object which, among a few other things, establishes the run loop. (A run loop registers input sources and enables the delivery of input events to your app.) Most of this work is done by the NSApplicationMain function, which is supplied for you by the AppKit framework and is automatically called in your project’s main.m source file.

Note: The AppKit framework provides all the classes that an app needs to construct and manage its user interface. The AppKit framework is just one of many object-oriented frameworks provided by Cocoa, which is the app environment for all Mac apps.

Make sure the project navigator is open in the navigator area.
The project navigator displays all the files in your project. If the project navigator is not open, click the leftmost button in the navigator selector bar:
Open the Supporting Files folder in the project navigator by clicking the disclosure triangle next to it.
Xcode opens the source file in the editor area of the window, which should look similar to this:

The call to the NSApplicationMain function creates an instance of the NSApplication class and an instance of the AppDelegate class, which is provided for you by the Cocoa Application template. In this tutorial, the singleton instance of this class is referred to as the app delegate. The main job of the app delegate is to provide a window you can access through its window property. The window object provides a container for the app’s visible content and helps deliver events to other app objects. The app delegate can also perform some app configuration tasks before the app is displayed. You add your custom behavior and logic to the AppDelegate class and any other classes you create.

The instance of the NSApplication class, called the app object, loads the main nib file when the app launches. Nib files are an archive of UI elements and other objects. The main nib file, MainMenu.

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