BREAKING CHANGE: UIScrollView now uses XAML ScrollViewer control behind the scenes

[ArnOmsft]

With this week’s release comes a change to UIScrollView we wanted to share more information about. We have replaced the previous custom implementation of UIScrollView with one that uses the XAML ScrollViewer control behind the scenes. This change might not be fully transparent for any app that’s using the current implementation since the new implementation does not currently support some properties that were supported in the previous implementation.

Here is a summary of what comes with this new implementation compared to what’s available today:

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Feature	Current Implementation	New implementation
- setContentOffset:animated:	Yes	Yes
contentOffset	Yes	Yes
contentSize	Yes	Yes
contentInset	Yes	Yes
scrollEnabled	Yes	Yes
directionalLockEnabled	No	Yes
scrollsToTop	No	No
- scrollRectToVisible:animated:	Yes	Yes
pagingEnabled	Yes	Yes
bounces	Yes	No
alwaysBounceVertical	Yes	No
alwaysBounceHorizontal	Yes	No
- touchesShouldBegin:withEvent:inContentView:	No	No
- touchesShouldCancelInContentView:	No	No
delaysContentTouches	No	No
decelerationRate	No	No
dragging	Yes	Yes
tracking	Yes	Yes
decelerating	Yes	Yes
indicatorStyle	No	No
showsHorizontalScrollIndicator	Yes	Yes
showsVerticalScrollIndicator	Yes	Yes
- flashScrollIndicators	No	No
panGestureRecognizer	Yes	No
pinchGestureRecognizer	Yes	No
- zoomToRect:animated:	Yes	Yes
zoomScale	Yes	Yes
- setZoomScale:animated:	Yes	Yes
maximumZoomScale	Yes	Yes
minimumZoomScale	Yes	Yes
zoomBouncing	Yes	No
zooming	Yes	Yes
bouncesZoom	Yes	No
Double tap auto-zooming	Yes	Yes
delegate	Yes	Yes
- scrollViewDidScroll:	Yes	Yes
- scrollViewWillBeginDragging:	Yes	Yes
- scrollViewWillEndDragging:withVelocity:targetContentOffset:	Yes	Yes
- scrollViewDidEndDragging:willDecelerate:	Yes	Yes
- scrollViewShouldScrollToTop:	No	No
- scrollViewDidScrollToTop:	No	No
- scrollViewWillBeginDecelerating:	Yes	Yes
- scrollViewDidEndDecelerating:	Yes	Yes
- viewForZoomingInScrollView:	Yes	Yes
- scrollViewWillBeginZooming:withView:	Yes	Yes
- scrollViewDidEndZooming:withView:atScale:	Yes	Yes
- scrollViewDidZoom:	Yes	Yes
- scrollViewDidEndScrollingAnimation:	Yes	Yes
keyboardDismissMode	No	No