UIModalTransitionStyleFlipHorizontal flips Vertically in Landscape - iphone

Question

When in landscape, transitioning from one view (that's part of a Navigation Controller stack) to another as a modal view, with UIModalTransitionStyleFlipHorizontal set as the modalTransitionStyle, the view flips vertically in landscape mode.
Everything else about the look of the views is fine after the animation, though I did notice that the frame size of the views isn't changing which is causing issues in other places of my code as well. I figured if I fix whatever is making this particular flip vertical instead of horizontal, it will fix the other issue.
I assume it has something to do with the window itself not changing orientation, but I'm not sure that's it.
Anyone have any ideas?

Answer 1

Talked to an Apple Engineer at WWDC and figured out the UIModalTransitionStyleFlipHorizontal does not work in landscape, it will flip what looks like in vertical.
The other issue I mentioned was because I wasn't adapting a frame to the view correctly.

Answer 2

There is a solution for this if you use iOS7 custom view controller transition. The ViewController which initiates the transition should confirm to protocols an implement the following methods.
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController: (UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
return (id<UIViewControllerAnimatedTransitioning>)self;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
return (id<UIViewControllerAnimatedTransitioning>)self;
}
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext {
return 0.7f;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {
UIView *containerView = [transitionContext containerView];
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
[containerView addSubview:fromVC.view];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
[containerView addSubview:toVC.view];
UIViewAnimationOptions animationOption;
if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && UIInterfaceOrientationIsLandscape(self.interfaceOrientation)) {
animationOption = ([toVC.presentedViewController isEqual:fromVC])?UIViewAnimationOptionTransitionFlipFromTop:UIViewAnimationOptionTransitionFlipFromBottom;
}
else {
animationOption = ([toVC.presentedViewController isEqual:fromVC])?UIViewAnimationOptionTransitionFlipFromLeft:UIViewAnimationOptionTransitionFlipFromRight;
}
[UIView transitionFromView:fromVC.view
toView:toVC.view
duration:[self transitionDuration:transitionContext]
options:animationOption
completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
}];
}
The transitioning delegate of the modal ViewController to be displayed should be set like this:
[modalViewController setTransitioningDelegate:self];
For example this linke can be put in the prepareForSegue: method.
That's it.