[iOS] CollectionView with header or footer has incorrect height

[kubaflo]

Description

When using a CollectionView with a HeaderTemplate or FooterTemplate, the calculated height of the CollectionView does not include the height of the header and footer. As a result, the total height of the CollectionView is incorrectly measured, leading to unexpected UI issues.

<VerticalStackLayout>
       <CollectionView>
              <CollectionView.ItemsSource>
                     <Array Type="{x:Type x:String}">
                            <x:String>item1</x:String>
                            <x:String>item2</x:String>
                            <x:String>item3</x:String>
                     </Array>
              </CollectionView.ItemsSource>
              <CollectionView.ItemTemplate>
                     <DataTemplate>
                            <Label AutomationId="{Binding .}"
                                   Text="{Binding .}"/>
                     </DataTemplate>
              </CollectionView.ItemTemplate>
              <CollectionView.HeaderTemplate>
                     <DataTemplate>
                            <BoxView HeightRequest="100"
                                          BackgroundColor="Green"/>
                     </DataTemplate>
              </CollectionView.HeaderTemplate>
              <CollectionView.FooterTemplate>
                     <DataTemplate>
                            <BoxView HeightRequest="200"
                                          BackgroundColor="Blue"/>
                     </DataTemplate>
              </CollectionView.FooterTemplate>
       </CollectionView>
</VerticalStackLayout>

Expected (Android)	Actual (iOS)

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

9.0.40 SR4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• [iOS] CollectionView's height does not include measured height of Header and Footer to size of Content #23435 , similarity score: 85%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

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