UIScrollView: Introduction
On iOS, a lot of scenes involved having a working UIScrollView related UI, even the marvelous UITableView and UICollectionView are implemented on top of it. The following screenshots are examples of UIScrollView usage in App Store app. One of the WWDC talk even mentioned more than 80% of the app on App Store are using UITableView, UICollectionView or both.
What does an UIScrollView do?
It’s easy to realize the main feature an UIScrollView provides is make its subviews scrollable, thus user could view more/other contents on the same page. Since it presents the content on a plain surface, it naturally could be scrolled horizontally and vertically. While people sometimes would ignore the other key feature UIScrollView provides is Zooming. Zooming could help user have more content, more detailed content be presented to them.
Summary:
UIScrollView helps user to easily interact with fruitful content on a single page. Scroll and Zoom are the two feature actions of it.
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