apple.uikit.protocol

Interface UIScrollViewDelegate

All Known Subinterfaces:

PKCanvasViewDelegate, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIScrollViewAccessibilityDelegate, UITableViewDelegate, UITextViewDelegate

All Known Implementing Classes:

CABTMIDICentralViewController, SLComposeServiceViewController, UICollectionViewController, UITableViewController, UIWebView

public interface UIScrollViewDelegate

Method Summary

Modifier and Type	Method and Description
default void	scrollViewDidChangeAdjustedContentInset(UIScrollView scrollView) Also see -[UIScrollView adjustedContentInsetDidChange]
default void	scrollViewDidEndDecelerating(UIScrollView scrollView) called when scroll view grinds to a halt
default void	scrollViewDidEndDraggingWillDecelerate(UIScrollView scrollView, boolean decelerate) called on finger up if the user dragged.
default void	scrollViewDidEndScrollingAnimation(UIScrollView scrollView) called when setContentOffset/scrollRectVisible:animated: finishes.
default void	scrollViewDidEndZoomingWithViewAtScale(UIScrollView scrollView, UIView view, double scale) scale between minimum and maximum.
default void	scrollViewDidScroll(UIScrollView scrollView) any offset changes
default void	scrollViewDidScrollToTop(UIScrollView scrollView) called when scrolling animation finished.
default void	scrollViewDidZoom(UIScrollView scrollView) any zoom scale changes
default boolean	scrollViewShouldScrollToTop(UIScrollView scrollView) return a yes if you want to scroll to the top.
default void	scrollViewWillBeginDecelerating(UIScrollView scrollView) called on finger up as we are moving
default void	scrollViewWillBeginDragging(UIScrollView scrollView) called on start of dragging (may require some time and or distance to move)
default void	scrollViewWillBeginZoomingWithView(UIScrollView scrollView, UIView view) called before the scroll view begins zooming its content
default void	scrollViewWillEndDraggingWithVelocityTargetContentOffset(UIScrollView scrollView, CGPoint velocity, CGPoint targetContentOffset) called on finger up if the user dragged.
default UIView	viewForZoomingInScrollView(UIScrollView scrollView) return a view that will be scaled.

Method Detail

scrollViewDidEndDecelerating

default void scrollViewDidEndDecelerating(UIScrollView scrollView)

called when scroll view grinds to a halt

scrollViewDidEndDraggingWillDecelerate

default void scrollViewDidEndDraggingWillDecelerate(UIScrollView scrollView,
                                                    boolean decelerate)

called on finger up if the user dragged. decelerate is true if it will continue moving afterwards

scrollViewDidEndScrollingAnimation

default void scrollViewDidEndScrollingAnimation(UIScrollView scrollView)

called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating

scrollViewDidEndZoomingWithViewAtScale

default void scrollViewDidEndZoomingWithViewAtScale(UIScrollView scrollView,
                                                    UIView view,
                                                    double scale)

scale between minimum and maximum. called after any 'bounce' animations

scrollViewDidScroll

default void scrollViewDidScroll(UIScrollView scrollView)

any offset changes

scrollViewDidScrollToTop

default void scrollViewDidScrollToTop(UIScrollView scrollView)

called when scrolling animation finished. may be called immediately if already at top

scrollViewDidZoom

default void scrollViewDidZoom(UIScrollView scrollView)

any zoom scale changes

scrollViewShouldScrollToTop

default boolean scrollViewShouldScrollToTop(UIScrollView scrollView)

return a yes if you want to scroll to the top. if not defined, assumes YES

scrollViewWillBeginDecelerating

default void scrollViewWillBeginDecelerating(UIScrollView scrollView)

called on finger up as we are moving

scrollViewWillBeginDragging

default void scrollViewWillBeginDragging(UIScrollView scrollView)

called on start of dragging (may require some time and or distance to move)

scrollViewWillBeginZoomingWithView

default void scrollViewWillBeginZoomingWithView(UIScrollView scrollView,
                                                UIView view)

called before the scroll view begins zooming its content

scrollViewWillEndDraggingWithVelocityTargetContentOffset

default void scrollViewWillEndDraggingWithVelocityTargetContentOffset(UIScrollView scrollView,
                                                                      CGPoint velocity,
                                                                      CGPoint targetContentOffset)

called on finger up if the user dragged. velocity is in points/millisecond. targetContentOffset may be changed to adjust where the scroll view comes to rest

viewForZoomingInScrollView

default UIView viewForZoomingInScrollView(UIScrollView scrollView)

return a view that will be scaled. if delegate returns nil, nothing happens

scrollViewDidChangeAdjustedContentInset

default void scrollViewDidChangeAdjustedContentInset(UIScrollView scrollView)

Also see -[UIScrollView adjustedContentInsetDidChange]