Fix [iOS]VerticalOffset Not Reset to Zero After Clearing ItemSource in CollectionView #26818
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Issue Details:
When clearing the ItemSource of a CollectionView, the VerticalOffset does not reset to zero on iOS and MacCatalyst. Instead, the last offset value is retained. However, after adding items back to the ItemSource, the VerticalOffset updates as expected when scrolling.
Root Cause:
The UIScrollView.ContentOffset retains its previous value even when the ItemSource is cleared, as there are no visible items in the CollectionView. The VerticalOffset property of the CollectionView depends on the ContentOffset value, which is not reset in such cases.
Description of Change
Reset HorizontalOffset and VerticalOffset to zero when ItemSource is empty and no items are visible.
Issues Fixed
Fixes #26798
Regarding Test case
The test case for this fix is included in this PR
Validated the behaviour in the following platforms
Output Screenshot
BeforeFix.mov
AfterFix.mov