How can I query the current orientation of an iPhone/iPad screen?

I was curious to know if there is some way to determine the orie开发者_运维问答ntation of a screen on iPhone/iPad.

Currently I find myself setting a member variable when this message is called:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
   self.orientation = interfaceOrientation;
   return YES;
}

... which feels like something I should be able to query as a state instead of having to track it when it changes.

UIViewController has the interfaceOrientation property.

Don't get confused by orientation in UIDevice, which is not the orientation of the interface, but the physical orientation.

Use this if you have a status bar on top.

UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) {
    // portrait             
} else {
    // landscape
}

You can do [[UIDevice currentDevice] orientation].