22 Core Data
When deciding between approaches to saving and loading for iOS applications, the first question is “Local or remote?” If you want to save data to a remote server, you will likely use a web service. If you want to store data locally, you have to ask another question: “Archiving or Core Data?”
Your Homepwner application used keyed archiving to save item data to the filesystem. The biggest drawback to archiving is its all-or-nothing nature: To access anything in the archive, you must unarchive the entire file, and to save any changes, you must rewrite the entire file. Core Data, on the other hand, can fetch a subset of the stored objects. And if you change any of those objects, you can update just that part of the file. ...
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