I have a class which supports UIViewControllerAnimatedTransitioning.

Within is a func named
func animateTransition(using transitionContext: UIViewControllerContextTransitioning)

Within that, I’m performing an animation, and doing this:

        UIView.animate(withDuration: totalDuration) {
            fromVC.view.alpha = 0
        } completion: { success in
            transitionContext.completeTransition(success)
        }

I’m passing the boolean from the animation completion block into completeTransition. I’ve seen it both ways online, but I’ve seen a lot more people ignore that success value, and just pass in !transitionContext.transitionWasCancelled.

So, the question is, what am I misinterpreting about this value? It seems that the success value has a different meaning than what is passed into completeTransition, but I’m having trouble understanding that meaning.