17. An iOS Extension
Frameworks have been part of Cocoa since the days of NeXTStep. A framework is a kind of bundle, a directory that is meant to be treated as a single, indivisible unit (see Chapter 22, “Bundles and Packages,” for details). In the case of a framework, the directory contains a dynamic library, plus the resources—NIBs, image files, etc.—the library needs to provide an integrated, shareable, reusable package of services.
Frameworks are in wide use in OS X not just as open or commercial projects to pass among themselves, but as units of the operating system itself. Look in /System/Library and /Library to find Frameworks/ directories for every function in OS X that isn’t at the level of the Unix kernel.
As an offshoot of the Darwin ...
Get Xcode 6 Start to Finish: iOS and OS X Development, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
