ButtonTap-> Dismiss B, Present C & Don't Show A - ios

Question

Question: How do I dismiss B, Present C, and Not Show A?
So there are three view controllers (A, B, and C). View A presents view B. Tapping a button on B should dismiss B and show C. The transition should appear to be direct from B -> C.
Option 1 - Fail
It can't be a simple segue presenting C because I need B to go away.
Option 2 - Fail
This thread almost answers my question. It suggests using delegation to call a function in A, which dismisses B and presents C. I tried it and it certainly dismisses B and presents C, but even with animation turned off it clearly shows B-> A -> C. The user sees A, so it's no good.
Option 3 - Fail
I also tried using an unwind segue. However, it just unwinds to A and stops. It appears that the presentSegue in A's unwind function fails to present C because it runs too early.
Note:
I'm not using a navigation controller, in case that matters

Answer 1

This will only work when B is wrapped in a navigation controller.
A presents(modal) navcontroller-wrapped-B.
B pushes C
Immediately after pushing(in the next line) set the viewControllers property to and array of just C.
Something like:
self.navigationController!.pushViewController(C, animated: true)
self.navigationController.viewControllers = [C]
Hope this helps.

Answer 2

You might want to reconsider your navigation pattern, as it is not something you can easily do. There's a navigation controller for that purpose, so why not to use it?
If you still want to do it your way, I can only think of adding a screenshot of dismissed view controller while presenting a new one. I'll give an example in Objective C, convert it to Swift yourself if needed.
Add UIViewController+Replace.h file to your project:
#import <UIKit/UIKit.h>
#interface UIViewController (Replace)
- (void)replaceWithViewController:(UIViewController* __nonnull)viewController animated:(BOOL)animated completion:(void (^ __nullable)(void))completion;
#end
Also add UIViewController+Replace.m:
#import "UIViewController+Replace.h"
static UIImage* RenderImageFromView(UIView *view, CGRect frame)
{
UIGraphicsBeginImageContextWithOptions(frame.size, YES, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *renderedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return renderedImage;
}
#implementation UIViewController (Replace)
- (void)replaceWithViewController:(UIViewController *)viewController animated:(BOOL)animated completion:(void (^)(void))completion
{
UIViewController *parentController = [self presentingViewController];
NSAssert(parentController != nil, #"Cannot replace root view controller");
CGRect bounds = self.view.frame;
UIImageView *captureView = [[UIImageView alloc] initWithFrame:bounds];
captureView.image = RenderImageFromView(self.view, bounds);
[parentController.view addSubview:captureView];
[self dismissViewControllerAnimated:NO completion:^{
[parentController presentViewController:viewController animated:animated completion:^{
[captureView removeFromSuperview];
if (completion)
completion();
}];
}];
}
#end
Then do #import "UIViewController+Replace.h" in B and open view controller C from it's code:
UIViewController *c = [self.storyboard instantiateViewControllerWithIdentifier:#"ViewControllerC"];
// or instantiate it whatever way you want
[self replaceWithViewController:c animated:YES completion:nil]
But again, it is some weird way of doing navigation. After all, modal view controllers are not intended for navigation.