The documentation states it's points
(per second, I'm assuming)? However, the values I get for it are in the (.5, 3.5)
range. The scroll view then travels several hundred points before coming to a halt. The actual initial velocity should be different by orders of magnitude.
It is points/millisecond. From UIScrollView.h:
// called on finger up if the user dragged. velocity is in points/millisecond. targetContentOffset may be changed to adjust where the scroll view comes to rest
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0);
This is from iOS 7 SDK, which seemed more plausible given the very low values they've been returning in velocity.
From Docs
called on finger up if the user dragged. velocity is in points/millisecond. targetContentOffset may be changed to adjust where the scroll view comes to rest
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