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If you didn't file something, provisional/patent, and no other application is accepted/pending with earlier date then your app release date, then it's probably public knowledge, and a prior art that will block anyone from filing.

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Not a lawyer, but I'm pretty sure you're wrong. It's harder to prove that your work predates something else, but if you can, you still have a copyright on it.

we're not talking about copyright law here, but patent law.

If @vjanma has a concrete way* to prove that his design is in the same timeframe as Apple's then they could challenge the patent application. The patent application is not a patent yet. So talk to a patent lawyer.

*you do have an application in the app store. But you may need much more documentation to challenge the patent.

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