Detecting iOS UIDevice orientation

Question

I need to detect when the device is in portrait orientation so that I can fire off a special animation. But I do not want my view to autorotate.

How do I override a

Answer 1

If you came to this question looking for how to detect an orientation change (without necessarily wanting to disable the rotation), you should also be aware of viewWillTransitionToSize, which is available from iOS 8.

Swift example from here

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {

    coordinator.animateAlongsideTransition({ (UIViewControllerTransitionCoordinatorContext) -> Void in

        let orient = UIApplication.sharedApplication().statusBarOrientation

        switch orient {
        case .Portrait:
            println("Portrait")
            // Do something
        default:
            println("Anything But Portrait")
            // Do something else
        }

        }, completion: { (UIViewControllerTransitionCoordinatorContext) -> Void in
            println("rotation completed")
    })

    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
}

And if you don't need to worry about the actual orientation:

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {

    // do something

    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
}

Objective-C example from here

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator
{   
    [coordinator animateAlongsideTransition:^(id context)
    {
        UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
        // do whatever
    } completion:^(id context)
    { 

    }];

    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

And if you don't need to worry about the actual orientation (taken from this answer):

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator
{
    // Do view manipulation here.
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

See also

• iOS 8 Orientation Change Detection
• iOS8 Day-by-Day :: Day 14 :: Rotation Deprecation