Here\'s a tricky iPhone problem I\'ve been working on. I have three UIScrollViews on a page, one that only scrolls horizontally, one that only scrolls vertically, and one th
I think the simplest way would be to add a delegate to your scrollviews which implement the following method:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
Then you can check the contentOffset to check by how much the scrollview did actually scroll, and update the main scrollview accordingly.