How can a visual highlight be shown on the last tapped item after navigation while keeping the item tappable again?
To show a visual highlight, use an item-level ViewModel flag (such as IsHighlighted) and bind it to a VisualState. Do not rely on SelectedItem, because selection disables immediate retapping. Clear selection and let the flag control the highlight.
What is the best way to determine which items are visible while scrolling in a CollectionView?
Use ItemsViewScrolled in MAUI. The event arguments provide the indices of the first, center, and last visible items.
How can auto-scrolling to the latest message be implemented only when the user is already near the bottom?
Track the last visible index using ItemsViewScrolled. Auto-scrolling only when the user is within a certain threshold of the bottom ( e.g., the last two or three items prevents the interruption of active scrolling.
What layout structure is recommended to avoid whitespace and scrolling issues when using CollectionView on iOS?
Place the CollectionView directly in a Grid row with Height=”*”, or inside a well-bounded AbsoluteLayout zone. Avoid wrapping it in a ScrollView or StackLayout that allows infinite height.
Why might a layout behave correctly on Android, but show spacing or measurement issues on iOS when used with a CollectionView?
iOS uses different measurements and estimated sizing rules. It is more sensitive to unbounded or nested layouts. Choose predictable heights and test on both platforms, as the measurement order differs between them.