RootViewController Switch Transition Animation

Question

You can wrap the switching of the rootViewController in a transition animation block:

[UIView transitionWithView:self.window
                  duration:0.5
                   options:UIViewAnimationOptionTransitionFlipFromLeft
                animations:^{ self.window.rootViewController = newViewController; }
                completion:nil];

I found this and works perfectly:

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:0.5 animations:^{
        snapShot.layer.opacity = 0;
        snapShot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
    } completion:^(BOOL finished) {
        [snapShot removeFromSuperview];
    }];
}

in your app

 if (!app) { app = (AppDelegate *)[[UIApplication sharedApplication] delegate]; }
        [app changeRootViewController:newViewController];

credits:

https://gist.github.com/gimenete/53704124583b5df3b407

I am posting Jesus answer implemented in swift. It takes viewcontroller's identifier as an argument, loads from storyboard desiredViewController and changes rootViewController with animation.

Swift 3.0 Update:

  func changeRootViewController(with identifier:String!) {
    let storyboard = self.window?.rootViewController?.storyboard
    let desiredViewController = storyboard?.instantiateViewController(withIdentifier: identifier);

    let snapshot:UIView = (self.window?.snapshotView(afterScreenUpdates: true))!
    desiredViewController?.view.addSubview(snapshot);

    self.window?.rootViewController = desiredViewController;

    UIView.animate(withDuration: 0.3, animations: {() in
      snapshot.layer.opacity = 0;
      snapshot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
      }, completion: {
        (value: Bool) in
        snapshot.removeFromSuperview();
    });
  }

Swift 2.2 Update:

  func changeRootViewControllerWithIdentifier(identifier:String!) {
    let storyboard = self.window?.rootViewController?.storyboard
    let desiredViewController = storyboard?.instantiateViewControllerWithIdentifier(identifier);

    let snapshot:UIView = (self.window?.snapshotViewAfterScreenUpdates(true))!
    desiredViewController?.view.addSubview(snapshot);

    self.window?.rootViewController = desiredViewController;

    UIView.animateWithDuration(0.3, animations: {() in
      snapshot.layer.opacity = 0;
      snapshot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
      }, completion: {
        (value: Bool) in
        snapshot.removeFromSuperview();
    });
  }

  class func sharedAppDelegate() -> AppDelegate? {
    return UIApplication.sharedApplication().delegate as? AppDelegate;
  }

After, you have a very simple usage from anywhere:

let appDelegate = AppDelegate.sharedAppDelegate()
appDelegate?.changeRootViewControllerWithIdentifier("YourViewControllerID")

Swift 3.0 update

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.changeRootViewController(with: "listenViewController")

Swift 2

UIView.transitionWithView(self.window!, duration: 0.5, options: UIViewAnimationOptions.TransitionFlipFromLeft, animations: {
  self.window?.rootViewController = anyViewController
}, completion: nil)

Swift 3, 4, 5

UIView.transition(with: self.window!, duration: 0.5, options: UIView.AnimationOptions.transitionFlipFromLeft, animations: {
  self.window?.rootViewController = anyViewController
}, completion: nil)

just try this. Works fine for me.

BOOL oldState = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
self.window.rootViewController = viewController;
[UIView transitionWithView:self.window duration:0.5 options:transition animations:^{
    //
} completion:^(BOOL finished) {
    [UIView setAnimationsEnabled:oldState];
}];

EDIT:

This one is better.

- (void)setRootViewController:(UIViewController *)viewController
               withTransition:(UIViewAnimationOptions)transition
                   completion:(void (^)(BOOL finished))completion {
    UIViewController *oldViewController = self.window.rootViewController;
    [UIView transitionFromView:oldViewController.view 
                        toView:viewController.view
                      duration:0.5f
                       options:(UIViewAnimationOptions)(transition|UIViewAnimationOptionAllowAnimatedContent|UIViewAnimationOptionLayoutSubviews)
                    completion:^(BOOL finished) {
        self.window.rootViewController = viewController;
        if (completion) {
            completion(finished);
        }
    }];
}