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Animated rootViewController transition
// put this in your AppDelegate
- (void)changeRootViewController:(UIViewController*)viewController {
if (!self.window.rootViewController) {
self.window.rootViewController = viewController;
return;
}
UIView *snapShot = [self.window snapshotViewAfterScreenUpdates:YES];
[viewController.view addSubview:snapShot];
self.window.rootViewController = viewController;
[UIView animateWithDuration:0.3 animations:^{
snapShot.layer.opacity = 0;
snapShot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
} completion:^(BOOL finished) {
[snapShot removeFromSuperview];
}];
}
@olivaresf

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olivaresf commented Jan 16, 2015

Works beautifully. Thanks!

@hirenpanchal1608

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hirenpanchal1608 commented Feb 4, 2015

Hello,

I want to do it in my viewcontroller, not in appdelegate.
And in my viewcontroller i have applied this code with necessary changes, but it is not working,

My code is :

UIViewController *rootViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];

UIView *snapShot = [self.view.window snapshotViewAfterScreenUpdates:YES];
[self.view addSubview:snapShot];
self.view.window.rootViewController = rootViewController;
[UIView animateWithDuration:1 animations:^{
    snapShot.layer.opacity = 0;
    snapShot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
} completion:^(BOOL finished) {
    [snapShot removeFromSuperview];
}];
@swain

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swain commented May 26, 2015

mark, great!

@rtimpone

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rtimpone commented Aug 28, 2015

Nice, this works great! I actually ended up implementing this as a category on UIWindow:

@interface UIWindow (Additions)

- (void)setRootViewController: (UIViewController *)rootViewController animated: (BOOL)animated;

@end

@implementation UIWindow (Additions)

- (void)setRootViewController: (UIViewController *)rootViewController animated: (BOOL)animated
{
    UIView *snapShotView;

    if (animated)
    {
        snapShotView = [self snapshotViewAfterScreenUpdates: YES];
        [rootViewController.view addSubview: snapShotView];
    }

    [self setRootViewController: rootViewController];

    if (animated)
    {
        [UIView animateWithDuration: 0.3 animations:^{

            snapShotView.layer.opacity = 0;
            snapShotView.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);

        } completion:^(BOOL finished) {

            [snapShotView removeFromSuperview];

        }];
    }
}

@end

And in the app delegate, I used it like this:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName: @"Main" bundle: nil];
UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier: @"controllerIdentifier"];
[self.window setRootViewController: vc animated: YES];
@Bodacious

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Bodacious commented Dec 1, 2015

Nice!

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