iOS 8 Rotation Methods Deprecation - Backwards Compatibility

Question

In iOS 8, the methods for interface rotation are deprecated. This includes:

• willRotateToInterfaceOrientation:duration:
• didRotateFromInterfaceOrientation:
• willAnimateRotationToInterfaceOrientation:duration:

The replacement methods include:

• willTransitionToTraitCollection:withTransitionCoordinator:
• viewWillTransitionToSize:withTransitionCoordinator:

If the new rotation methods are not implemented, and a project is compiled with the iOS 8 SDK, the view controllers -will not receive calls- to the deprecated rotation methods.

My concern is this: What happens to an app already in the AppStore built with the iOS 7 SDK? Will the deprecated rotation methods still be called on an iOS 8 device or not?

EDIT:

The rotation methods are still called, but there exist some changes/issues/bugs in iOS 8.

Also UIScreen is now interface oriented

Answer 1

I just had this issue and I wanted to use the same methods that I was using before (at least for now), so this is what I did.

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

    //The device has already rotated, that's why this method is being called.
    UIInterfaceOrientation toOrientation   = [[UIDevice currentDevice] orientation];
    //fixes orientation mismatch (between UIDeviceOrientation and UIInterfaceOrientation)
    if (toOrientation == UIInterfaceOrientationLandscapeRight) toOrientation = UIInterfaceOrientationLandscapeLeft;
    else if (toOrientation == UIInterfaceOrientationLandscapeLeft) toOrientation = UIInterfaceOrientationLandscapeRight;

    UIInterfaceOrientation fromOrientation = [[UIApplication sharedApplication] statusBarOrientation];

    [self willRotateToInterfaceOrientation:toOrientation duration:0.0];
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        [self willAnimateRotationToInterfaceOrientation:toOrientation duration:[context transitionDuration]];
    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        [self didRotateFromInterfaceOrientation:fromOrientation];
    }];

}

I'm still not sure if I should use this outside of the animation block since I don't have the duration.

    [self willRotateToInterfaceOrientation:toOrientation duration:0.0];