A scroll view lets users browse content that’s larger than the visible area. As a user swipes, flicks, drags, and taps, a scroll view follows the gesture, revealing or zooming content in a way that feels natural. A scroll view itself has no appearance, but does display transient scrolling indicators as people interact with it. A scroll view can also be configured to operate in paging mode, where scrolling reveals an entirely new page of content rather than moving around the current page.
Don’t place a scroll view inside another scroll view. Doing so creates an unpredictable interface that’s difficult to control.
In general, display one scroll view at a time. People often make large swipe gestures when scrolling, and it can be hard to avoid interacting with a neighboring scroll view on the same screen. If you need to put two scroll views on one screen, consider allowing them to scroll in different directions so one gesture is less likely to affect both views.
For developer guidance, see UIScrollView.