UIScrollView: single tap scrolls it to top

Question

I have the UIScrollView with pagingEnabled set to YES, and programmatically scroll its content to bottom:

CGPoint contentOffset = scrollView.contentOffset;
contentOffset.y = scrollView.contentSize.height - scrollView.frame.size.height;
[scrollView setContentOffset:contentOffset animated:YES];

it scrolls successfully, but after that, on single tap its content scrolls up to offset that it has just before it scrolls down. That happens only when I programmaticaly scroll scrollView's content to bottom and then tap. When I scroll to any other offset and then tap, nothing is happened.

That's definitely not what I'd like to get. How that should be fixed?

Much thanks in advance!

Timur.

Answer 1

This small hack prevents the UIScrollView from scrolling when tapped. Looks like this is happening when the scroll view has paging enabled.

In your UIScrollView delegate add this method:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    scrollView.pagingEnabled = self.scrollView.contentOffset.x < (self.scrollView.contentSize.width - self.scrollView.frame.size.width);
}

This disables the paging when the scroll view reaches the right end in horizontal scrolling (my use case, you can adapt it to other directions easily).