UIInterfaceOrientation
The initial orientation of the app’s user interface.
Possible Values
UIInterfaceOrientationPortraitThe device is in portrait mode, with the device upright and the Home button on the bottom.
UIInterfaceOrientationPortraitUpsideDownThe device is in portrait mode but is upside down, with the device upright and the Home button at the top.
UIInterfaceOrientationLandscapeLeftThe device is in landscape mode, with the device upright and the Home button on the left.
UIInterfaceOrientationLandscapeRightThe device is in landscape mode, with the device upright and the Home button on the right.
Discussion
The default value is UIInterfaceOrientationPortrait. If you add the UISupportedInterfaceOrientations key to the information property list, the system ignores this key.
For more information, see UIInterfaceOrientation.