iPhone - dismiss multiple ViewControllers

Question

I have a long View Controllers hierarchy;

in the first View Controller I use this code:

SecondViewController *svc = [[SecondViewController alloc] i         


        

Answer 1

iOS 8+ universal method for fullscreen dismissal without wrong animation context. In Objective-C and Swift

Objective-C

- (void)dismissModalStackAnimated:(bool)animated completion:(void (^)(void))completion {
    UIView *fullscreenSnapshot = [[UIApplication sharedApplication].delegate.window snapshotViewAfterScreenUpdates:false];
    [self.presentedViewController.view insertSubview:fullscreenSnapshot atIndex:NSIntegerMax];
    [self dismissViewControllerAnimated:animated completion:completion];
}

Swift

func dismissModalStack(animated: Bool, completion: (() -> Void)?) {
    if let fullscreenSnapshot = UIApplication.shared.delegate?.window??.snapshotView(afterScreenUpdates: false) {
        presentedViewController?.view.addSubview(fullscreenSnapshot)
    }
    if !isBeingDismissed {
        dismiss(animated: animated, completion: completion)
    }
}

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tl;dr

What is wrong with other solutions?

There are many solutions but none of them count with wrong dismissing context so:

e.g. root A -> Presents B -> Presents C and you want to dismiss to the A from C, you can officialy by calling dismissViewControllerAnimated on rootViewController.

 [[UIApplication sharedApplication].delegate.window.rootViewController dismissModalStackAnimated:true completion:nil];

However call dismiss on this root from C will lead to right behavior with wrong transition (B to A would have been seen instead of C to A).

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so

I created universal dismiss method. This method will take current fullscreen snapshot and place it over the receiver's presented view controller and then dismiss it all. (Example: Called default dismiss from C, but B is really seen as dismissing)