State will be triggered all the time, and not to be loading

[sou1x0]

Because infinite scrolling view's height is 60pt, user can scroll to the mid of the infinite scroll view. In this situation, state is triggered all the time and not to be loading, even if user leave his finger from the screen. I think the reason is that when the last scrollViewDidScroll is triggered, isDragging is still true, not false. Then when user leaves his finger, scrollViewDidScroll will not be called.