I have developed an app for the iPhone, and I know Apple would like any apps to support multiple orientations on the iPad, but I'm wondering if it's actually required: Will the iPhone app be rejected for only supporting one orientation?
Thanks in advance
I have no experience with Apple development whatsoever, but my expectations are they will enforce it because of user expectation. Users most likely expect the app to be usable in all orientations.
No. It's not a requirement.
However, it is so simple to implement in most cases that if your application does not absolutely requires a particular orientation to work(i.e. two hands touches based interaction), it would be sad to not implement it.
Not necessarily. I have seen an iPad only app which only supports portrait and portrait upside down orientations which has been accepted into the App store. There are also several iPad piano apps in the App store which only display the keyboard the long way (landscape).
You may to support at least two orientations: foo and foo upside down.
The "flixster" app in the appstore only supports landscape and landscape-upside down views, so clearly (along with hotpaw2's answer) at least two people have got away without supporting all the orientations.
Much like anything else to do with app store reviews, I suspect you may or may not get away with it, depending on how the reviewer feels. The documentation says:
"With few exceptions, applications should support all interface orientations on iPad devices."
which would tend to suggest there's a risk (albeit perhaps a small one) that your app will get rejected.
This used to be the case when the iPad was first released a long with the first release of the HIG. This is no longer the case now. They even changed the wording in the HIG.
The key is that whatever orientation you do support, make sure you support both. Meaning, if you do Portrait, then do Portrait upside down too. If you do Landscape Left, then make sure you do Landscape Right.