7IOS NETWORKING
Almost all applications use one or more of three iOS network APIs. In order of abstraction, these are the URL loading system, the Foundation NSStream API, and the Core Foundation CFStream API. The URL loading system is used for fetching and manipulating data, such as network resources or files, via URLs. The NSStream and CFStream classes are slightly lower-level methods to deal with network connections, without going quite so low as the socket level. These classes are used for non-HTTP-based communications, or where you need more direct control over network behavior.
In this chapter, I’ll discuss iOS networking in detail, starting from the high-level APIs. For most purposes, apps can stick with the higher-level APIs, but there ...
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