Working with Basic Orientation
The UIDevice class uses the built-in orientation property to provide the physical orientation of a device. iOS devices support seven possible values for this property:
UIDeviceOrientationUnknown—The orientation is currently unknown.
UIDeviceOrientationPortrait—The home button is down.
UIDeviceOrientationPortraitUpsideDown—The home button is up.
UIDeviceOrientationLandscapeLeft—The home button is to the right.
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