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Editorial Team
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Asked: 2026-05-18T00:34:32+00:00

I’m implementing what essential amounts to an RSS reader for iPhone. I download a

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I’m implementing what essential amounts to an RSS reader for iPhone. I download a bunch of short messages and display them to the user in a list. Each message is encapsulated in a MyMessage object that contains the title, the body, url, etc.

I want to be sure to cache the 20 most recent messages. What is the best way to do this? Should I use a keyed archive, and just have the MyMessage class implement the NSCoding protocol. If I choose this approach, can I append new message to the file containing the archive (and similarly, can I delete old messages when the message count exceeds 20)?

Essentially my question is: is using a keyed archive the right approach? And if so, how can I append/delete messages from the archive as necessary?

Thanks!

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1 Answer

  1. Editorial Team

    Why not use CoreData? Its fairly trivial to make that work with your simple object to cache.

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