iOS: Animating Incorrect Orientation at rootViewController?

Question

Context: I am trying to perform a custom animation from a normal UIViewController.view to a UISplitViewController.view. The animation should show from Left to Right.

I set self.window.rootViewController = viewController where viewController is a normal UIViewController.

Once the user swipe, the following gets called:

UIView *theWindow = [viewController.view superview];

[viewController.view removeFromSuperview];
[theWindow addSubview:self.splitViewController.view];


CATransition *animation = [CATransition animation];
[animation setDuration:0.5];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromLeft];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

[[theWindow layer] addAnimation:animation forKey:@"SwitchToView1"];

When the device is in a portrait mode, everything went perfectly. However, when the device is in the landscape mode, the transition animation performs as if the device is still in the portrait mode. For example: Instead of coming in from the left, it comes in from the bottom. The orientation of both the views are completely correct. Only the transition is weird.

Answer 1

So, I've been playing around with your code (I did a best-guess reconstruction of how you have your project set up), and I was able to get the desired effect with the following code. I tried setting the frames and bounds of layers, of views, or sublayers, etc., and none of that worked. CATransform3D's, CATransform3DRotates, etc also weren't doing the trick. I also Googled for a solid hour. Either no one has had your issue, or no one has solved your issue. Regardless, this solution works, and unless some Core Animation guru can provide a better solution, you're welcome to this:

- (void)swipeGesture:(UISwipeGestureRecognizer *)sender {

UIView *theWindow = [self.viewController.view superview];

UIInterfaceOrientation interfaceOrientation = self.viewController.interfaceOrientation;
NSString *subtypeDirection;
if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
    subtypeDirection = kCATransitionFromTop;
}
else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
    subtypeDirection = kCATransitionFromBottom;
}
else {
    subtypeDirection = kCATransitionFromLeft;
}

[self.viewController.view removeFromSuperview];
[theWindow addSubview:self.splitViewController.view];

CATransition *animation = [CATransition animation];
[animation setDuration:0.5];
[animation setType:kCATransitionPush];
[animation setSubtype:subtypeDirection];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

[[theWindow layer] addAnimation:animation forKey:@"SwitchToView1"];
}