In this recipe, we will use the NSNetServiceBrowser class to look for our published service.

The NSNetServiceBrowser class is used to find the services that are published by NSNetService. Once we initialize the NSNetServiceBrowser object, we need to assign a delegate, and then we can begin browsing for services. Taking into account the possibility of delays in receiving responses from the services and also because services can come online or go offline at any time, the NSNetServiceBrowser object performs the service discovery asynchronously. The NSNetServiceBrowser class relies on the delegate methods to handle the notifications of the services coming online or going offline.