21. Web Services
A web service is an application that runs on a web server. An iPhone application can ask a web service to execute methods that the web service implements. Typically, a web service’s methods will collect data from the iPhone application and store it in a database or return information from that database to the iPhone application (or both.) The data transferred between a web service and a client application is typically formatted into XML or JSON format.
To work with a web service, an iPhone application must make a connection to a web server, transfer properly formatted data between the two, and parse any data returned.
Figure 21.1. TopSongs application
Creating the TopSongs Application
In this chapter, you will use the Cocoa ...
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