If the two transitioning views have transparent backgrounds, you see a flicker at the end of the animation.
I resolved it by adding the following in ADDualTransition.m, at the end of finishInit
_inAnimation.fillMode = _outAnimation.fillMode = kCAFillModeForwards;
_inAnimation.removedOnCompletion = _outAnimation.removedOnCompletion = NO;
I haven't tested across all transitions, but it seems to do the trick for ADSwipeTransition.