Deactivate UIScrollView decelerating

Question

Is there a way to deactivate the decelerating of a UIScrollView?

I want to allow the user to scroll the canvas, but I don't want that the canvas continues scrolling after the user lifted the finger.

Answer 1

You can just turn up the deceleration rate very high. With an infinite rate, it would stop immediately. Try setting the rate to these constants:

scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;

and

scrollView.decelerationRate = UIScrollViewDecelerationRateFast;

If fast still isn't fast enough for you, UIScrollViewDecelerationRateFast is just typedef'ed as a float, so you can just multiply it by a factor of 10 or so to speed it up even more.

Answer 2

This can be done by utilizing the UIScrollView delegate method scrollViewWillBeginDecelerating to autmatically set the content offset to the current screen position.

To implement:

1. Assign a delegate to your UIScrollView object if you have not already done so.

2. In your delegates .m implementation file, add the following lines of code:

   -(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
   [scrollView setContentOffset:scrollView.contentOffset animated:YES];
   }

Voila! No more auto-scroll.