edc1591 edc1591 - 11 days ago 6
iOS Question

Swapping rootViewController with animation

I'm having a little trouble swapping rootViewControllers with animation. Here's the code that I'm using:

[UIView transitionWithView:self.window duration:0.8 options:UIViewAnimationOptionTransitionFlipFromRight animations:^{
self.window.rootViewController = self.navigationController;
} completion:nil];


It kind of works except that right before the animation, the screen turns to black and then the animation occurs. It looks like the original rootViewController is getting removed right before the animation. Any ideas?

Answer

transitionWithView is intended to animate subviews of the specified container view. It is not so simple to animate changing the root view controller. I've spent a long time trying to do it w/o side effects. See:

Animate change of view controllers without using navigation controller stack, subviews or modal controllers?

EDIT: added excerpt from referenced answer

[UIView transitionFromView:self.window.rootViewController.view
                    toView:viewController.view
                  duration:0.65f
                   options:transition
                completion:^(BOOL finished){
                    self.window.rootViewController = viewController;
                }];
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