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iPhone application development

Interface Builder document contains four elements:

Present owner of the proxy object. file object owner is the legal owner of such UIApplication-file are discussed later in "his file."

The representation of objects first responders. first-aid personnel are not used in this tutorial, but you can learn more about reading "Management event "in the iPhone Application Programming Guide.

An instance of HelloWorldAppDelegate delegating implementation. Delegates discussed in the next section.

A window. The window has a white background and is configured to be visible at launch. This is the window you see when the application is launched.

After the application has finished launching, you can perform additional customization. A common and will continue in the next chapter is shown in this diagram:

Where the subject of the application has completed installation, send a delegate applicationDidFinishLaunching: message. Instead of configuring the user interface itself, the delegate usually create a controller object (a special driver for the management of a view is consistent with the pattern Model-View-Controller as described in "Model-View-Controller). The delegate asked the driver to your point of view (the view controller creates demand) and add that as a subview of the window.

Summarize

In this article, you created a new project and I learned about the operation of the startup process of the application. In chapter Next, you need to define and create an instance to the controller.

Adding a view controller

In this application, you need two classes. Application Xcode template provided a delegate and application class is instantiated in the nib file. You need implement a controller class to view and create an instance of it.

Add Controller Class View

Driver see objects play a central role in most of the iPhone OS applications. As its name implies, are responsible for the management point of view, iPhone OS but also help in navigation and memory management. You will not use the features of it here, but it is important to be aware its future development. UIViewController UIKit provides more special class that encapsulates the default behavior you want from a Comptroller of view. You must create a subclass to customize the behavior of your application.

>> In Xcode project organizer to select the project (HelloWorld on top the list of groups and files) or the current record is the group of new files are added to the selection under way.

>> Select File> New Folder and New File window. Select the Cocoa Touch group classes, then select the UIViewController subclass. In the Options section, select Only XIB for the user interface.

Note: If you do not see "With XIB for the user interface" option make sure you have installed version 3.2 of the iPhone OS SDK, Xcode should show version 3.2.2 or later.

Selection "for the interface with XIB Xcode makes user creates a pen to support the view controller, and added to the project. (Nib files are discussed in detail in the next chapter.)

> Click Next and on the next screen gives the file a name like MyViewController again (by convention, class names are capitalized). Insurance the m And the files. H are created and add files to your project, as shown here:

> Click Finish, and make sure that the files have been added to your project.

If you look at the source of the new files you will see that the implementations of different methods Portal already delivered. This is all we need at this time, the next task is to create an instance of the class.

In the next article, we learn more about how to add a property View Controller

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