Designing Apps with Scroll Views

Scrolling easily through large amounts of content is integral to the ease of use of an iPhone, iPad, or iPod touch. UIScrollView and CATiledLayer provide ways for iPhone OS applications to display and manipulate content that that won't fit on the screen. Learn some of the techniques used in Apple's own applications. We'll explain centering zoomable content, zooming in on one piece of content while leaving another fixed in place, and other advanced uses of UIScrollView.

WWDC 2010 - iOS