Brandon Brandon - 2 months ago 19
iOS Question

Is there a non-deprecated method that matches didRotateFromInterfaceOrientation

I'm trying to find a method call I can latch onto once a device's orientation has changed. Is there something identical to didRotateFromInterfaceOrientation that isn't deprecated?

Answer

As of iOS 8, all UIViewControllers inherit the UIContentContainer protocol, one of whose methods is - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator, which you can (simplistically) override like this:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator
{
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

        // Stuff you used to do in willRotateToInterfaceOrientation would go here.
        // If you don't need anything special, you can set this block to nil.

    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {

        // Stuff you used to do in didRotateFromInterfaceOrientation would go here.
        // If not needed, set to nil.

    }];
}

You'll notice there's nothing specific about orientation, which is by design; iOS view rotations are essentially a composition of a specific translation matrix operation (resizing a view from one aspect ratio to another is just a specific case of a general resizing operation where the source and target view sizes are known in advance) and a rotation matrix operation (which is handled by the OS).

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