Beginning iPad™ Application Development

Chapter 16. Bonjour Programming

WHAT YOU WILL LEARN IN THIS CHAPTER:

• How to publish a service on the network using the NSNetService Class

• How to discover for services on the network using the NSNetServiceBrowser class

• How to resolve the IP addresses of services on the network so that you can communicate with them

Bonjour is Apple's implementation of the Zeroconf protocol, which enables the automatic discovery of computers, devices and services on an IP network. In this chapter, you will learn how to implement Bonjour on the iPad by using the NSNetService class to publish a service. You will also use the NSNetServiceBrowser class to discover services that have been published.

CREATING THE APPLICATION

The first thing you will do is to create the user interface for the application. You'll use a Table view to display the users that you have discovered on the network. As users are discovered, they will be added to the Table view.

TRY IT OUT: Creating the UI of the Application

1. Using Xcode, create a View-based Application project and name it Bonjour.

2. Double-click the BonjourViewController.xib file to edit it in Interface Builder. Populate the View window with the following views (see Figure 16-1):

   • Label (set its text as "Discovered Users")

   • Table View

   • Text View

   

   Figure 16.1. FIGURE 16-1

3. In the BonjourViewController.h file, add the following bold statements:

   #import <UIKit/UIKit.h> @interface BonjourViewController ...