Animated rootViewController transition

gistfile1.m

// 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];
    }];
}

mark, great!

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];

Nice!

Try this out!

let sb = UIStoryboard(name: "Main", bundle: nil)
let VC = sb.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
let navRootView = UINavigationController(rootViewController: VC)
self.present(navRootView, animated: true, completion: nil)