How to know exactly when a UIScrollView's scrolling has stopped?

Question

In short, I need to know exactly when the scrollview stopped scrolling. By \'stopped scrolling\', I mean the moment at which it is no longer moving and not being touched.

Answer 1

Here's how to combine scrollViewDidEndDecelerating and scrollViewDidEndDragging:willDecelerate to perform some operation when scrolling has finished:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    [self stoppedScrolling];
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView 
                  willDecelerate:(BOOL)decelerate
{
    if (!decelerate) {
        [self stoppedScrolling];
    }
}

- (void)stoppedScrolling
{
    // done, do whatever
}