Tells the delegate that the scroll view scrolled to the top of the content.
- iOS 2.0+
- tvOS 9.0+
The scroll-view object that perform the scrolling operation.
The scroll view sends this message when it finishes scrolling to the top of the content. It might call it immediately if the top of the content is already shown. For the scroll-to-top gesture (a tap on the status bar) to be effective, the
scrolls property of the
UIScroll must be set to YES.