The only sure-fire way to prevent cracking is to have all of the functionality be on your server and have the app be nothing more than a dummy client who can't run without your server sending it the necessary data.
This way, you can validate each time the app is run, you are validating constantly, and you can also have complete freedom to change the way it works on your server without messing with the iPhone app itself.
This is how all MMO games work, but it's probably not worthwhile for 99% of simple iPhone apps.
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