This is my part of my subclass of UIPresentationController:
override func presentationTransitionWillBegin() {
if let containerView = containerView {
dimmingView.frame = containerView.bounds
dimmingView.backgroundColor = UIColor.yellowColor()
containerView.insertSubview(dimmingView, atIndex: 0)
presentedViewController.transitionCoordinator()?.animateAlongsideTransition({ context in
self.dimmingView.backgroundColor = UIColor.greenColor() //line A
}, completion: nil)
}
}
The problem is, that I cannot see the yellow even for a millisecond. Why? What does it mean alongside transition? What transition? My transition duration is set within UIViewControllerAnimatedTransitioning to 5 seconds.
If I remove my line A, then I can see just yellow color and it is ok. Why this animation (from yellow to green) do not take my 5 seconds?
