UIDeviceOrientationFaceUp - how to distinguish between portrait and landscape?

Question

I'm trying to find out if the device is in portrait or landscape mode. My code works quite well if the device is not facing up. If it does face up (and orientation == 5), it won't distinguish between portrait and landscape. Is there anyway to determine the "orientation" in terms of landscape / portrait if the UIDeviceOrientation is FaceUp?

My code:

UIDeviceOrientation interfaceOrientation = [[UIDevice currentDevice] orientation];

NSLog(@"orientation: %d", interfaceOrientation);

if (interfaceOrientation == UIDeviceOrientationIsLandscape(interfaceOrientation)) {
    NSLog(@"LANDSCAPE!!!");
}

if (interfaceOrientation == UIDeviceOrientationIsPortrait(interfaceOrientation)) {
    NSLog(@"PORTRAIT!!!");
}

Answer 1

You should not confuse UIDeviceOrientation and UIInterfaceOrientation, they are different but related as shown by their declaration

typedef enum {
   UIDeviceOrientationUnknown,
   UIDeviceOrientationPortrait,
   UIDeviceOrientationPortraitUpsideDown,
   UIDeviceOrientationLandscapeLeft,
   UIDeviceOrientationLandscapeRight,
   UIDeviceOrientationFaceUp,
   UIDeviceOrientationFaceDown
} UIDeviceOrientation;

typedef enum {
   UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
   UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
   UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
   UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
} UIInterfaceOrientation;

UIDeviceOrientation tells you what the orientation of the device is. UIInterfaceOrientation tells you what the orientation of your interface is, and is used by UIViewController. UIInterfaceOrientation will clearly be either portrait or landscape, whereas UIDeviceOrientation can have ambiguous values (UIDeviceOrientationFaceUp, UIDeviceOrientationFaceDown, UIDeviceOrientationUnknown).

In any case you should not attempt to determine the orientation of a UIViewController with [[UIDevice currentDevice] orientation], as no matter what the device orientation is the UIViewController interfaceOrientation property can be different (for example if your app does not rotate to landscape at all [[UIDevice currentDevice] orientation] can be UIDeviceOrientationLandscapeLeft while viewController.interfaceOrientation can be UIInterfaceOrientationPortrait).

Update: As of iOS 8.0, [UIViewController interfaceOrientation] is deprecated. An alternative offered here is [[UIApplication sharedApplication] statusBarOrientation]. This also returns UIInterfaceOrientation.