An app where you can trade bitcoins is not allowed in the iOS app store by their rules. Even wallets are removed, like Blockchain.info. They are really strict with this, so your app will not be allowed or removed afterwards.
If an app contains trading functionality then it may be installed only on devices with jailbreak.
Let me clarify. In fact, Hitbtc is initially a currency exchange. Hitbtc is not Bitcoin-based project and it’s not a wallet, like Blockchain.
All we need are your ideas for Hitbtc exchange app, and we undertake the matters of submission this app to App Store.
Thank you for your attention.