December 2013
Beginner
576 pages
16h 4m
English
Content preview from Programming in Objective-C, Sixth Edition
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Archiving with NSKeyedArchiver
A more flexible approach enables you to save any type of objects to a file, not just strings, arrays, and dictionaries. This is done by creating a keyed archive using the NSKeyedArchiver class.
Mac OS X has supported keyed archives since version 10.2. Before that, sequential archives were created with the NSArchiver class. Sequential archives require that the data in the archive be read back in precisely the same order in which it was written.
A keyed archive is one in which each field of the archive has a name. When you archive an object, you give it a name, or key. When you retrieve it from the archive, you retrieve it by the same key. In that manner, objects can be written to the archive and retrieved in any ...
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