iOS scan for radio channels

I'm looking to scan for radio staion using an iOS device. I have no idea how to even begin this. I'm well versed in Objective-c; this is just not something I'm familiar with.

A point in the开发者_StackOverflow right direction would be fantastic.

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There's no official support in Apple SDKs for accessing the FM radio hardware, so even if you managed to find out how to access the hardware and got it working, you'd be unable to distribute the app.

There is apparently FM radio hardware from Broadcom in the iPod touch 3rd gen, but whether it is accessible is an open question.