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CollectionView2 Items display issue when Header/Footer is resized on iOS #27076

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CollectionView2 Items display issue when Header/Footer is resized on iOS #27076

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37 changes: 37 additions & 0 deletions src/Controls/src/Core/Handlers/Items2/iOS/StructuredItemsViewController2.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,11 @@ public class StructuredItemsViewController2<TItemsView> : ItemsViewController2<T
public const int HeaderTag = 111;
public const int FooterTag = 222;

View _headerView;
View _footerView;
EventHandler _footerMeasureInvalidated;
EventHandler _headerMeasureInvalidated;

bool _disposed;

public StructuredItemsViewController2(TItemsView structuredItemsView, UICollectionViewLayout layout)
Expand All @@ -40,7 +45,11 @@ protected override void Dispose(bool disposing)

if (disposing)
{
if (_headerView != null)
_headerView.MeasureInvalidated -= _headerMeasureInvalidated;

if (_footerView != null)
_footerView.MeasureInvalidated -= _footerMeasureInvalidated;
}

base.Dispose(disposing);
Expand Down Expand Up @@ -115,26 +124,54 @@ void UpdateTemplatedSupplementaryView(TemplatedCell2 cell, NSString elementKind)

if (isHeader)
{
if (_headerView != null)
_headerView.MeasureInvalidated -= _headerMeasureInvalidated;

if (ItemsView.Header is View headerView)
{
_headerView = headerView;
cell.Bind(headerView, ItemsView);
}
else if (ItemsView.HeaderTemplate is not null)
{
_headerView = (View)ItemsView.HeaderTemplate.CreateContent();
cell.Bind(ItemsView.HeaderTemplate, ItemsView.Header, ItemsView);
}

_headerMeasureInvalidated = (s, e) =>
{
var indexPath = CollectionView.GetIndexPathForSupplementaryView(cell);
if (indexPath != null)
CollectionView.ReloadItems([indexPath]);
};

_headerView.MeasureInvalidated += _headerMeasureInvalidated;
cell.Tag = HeaderTag;
}
else
{
if (_footerView != null)
_footerView.MeasureInvalidated -= _footerMeasureInvalidated;

if (ItemsView.Footer is View footerView)
{
_footerView = footerView;
cell.Bind(footerView, ItemsView);
}
else if (ItemsView.FooterTemplate is not null)
{
_footerView = (View)ItemsView.FooterTemplate.CreateContent();
cell.Bind(ItemsView.FooterTemplate, ItemsView.Footer, ItemsView);
}

_footerMeasureInvalidated = (s, e) =>
{
var indexPath = CollectionView.GetIndexPathForSupplementaryView(cell);
if (indexPath != null)
CollectionView.ReloadItems([indexPath]);
};

_footerView.MeasureInvalidated += _footerMeasureInvalidated;
cell.Tag = FooterTag;
}
}
Expand Down
2 changes: 0 additions & 2 deletions src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue25362.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,6 @@ public Issue25362(TestDevice device) : base(device)

[Test]
[Category(UITestCategories.CollectionView)]
[FailsOnIOSWhenRunningOnXamarinUITest("This is not working for CV2 yet")]
[FailsOnMacWhenRunningOnXamarinUITest("This is not working for CV2 yet")]
public void HeaderShouldNotCollapseWithItems()
{
App.WaitForElement("button");
Expand Down
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