I'm new to iPhone development and I still have some gaps that needs to be filled in the first application I'm developing. This app will consume data from a site managed by Wordpress through the Wordpress JSON plugin, which allows to retrieve the posts in the form of a json string.
I wanted my application to store the posts in some form of caching, so that the users would only need to download the new content after the first time. Think about the Twitter App, that keeps all your previous loaded tweets and only load the new ones.
What's the best way to do that, should I save the json as a file or there are another more efficient method to keep it in cache?