Currently it seems there are no torproject.org "officially sanctioned" solutions for iOS. However, there is a browser called OnionBrowser that passes check.torproject.org and is able to access hidden services on the tor network.
So my question is, do we know how secure it is compared to running tor from Vidalia or even Orbot? Aside from the following warnings provided by OnionBrowser:
<video>tags will leak
<video>-related DNS queries and data transfer outside of Tor.
I guess one concern I have is how often the other tor software is updated and the inherent lag with availability of updates from both the developer and the App Store itself.
Otherwise is there anything I should know about using this to access Tor? Is it ill-advised in scenarios where security or anonymity is important?