How to share custom data between iPhone applications?

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There are two different ways you might go about this.

1) The data you need to share is non-persistent. In other words you need to launch one application with a piece of data that it can do something with. In this case you would register a special URL scheme per application.

You can find out more information about URL schemes via Craig Hockenberry in his [redacted] blog post.

2) The data you need to share is persistent. In other words you need something like a data file that both applications can read and write too. As far as I know there isn’t a safe way to do this other than storing your data on a remote server. If you need the data accessible without a data connection then you would need to figure out a way to sync data between the individual apps and the remote server.

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