I need to perform some special things at exactly the position where the scroll view will stop deceleration, but I need to know that position before it finished decelerating.
Is there a way to do it, or must I implement my own deceleration logic instead?
As for as I know there is no way to predict it before the scrollview actually finish decelerating. I don't know why do you want to predict it but I feel its always wise to wait for it to end the deceleration.
Though you create your own logic I am afraid it would give you the exact value. I wish you luck anyway :-)