Could a parent container, opacity setting, shadow, or overlay above the CollectionView create a blur like layer? How can this be confirmed?
Yes. Disable overlays temporarily, remove opacity or shadows, and test again. Use visual debugging (such as View Hierarchy inspection) to locate UI effect views. Removing layers one by one typically reveals the cause.
Why might CollectionView content appear blurred or frosted after an iOS or tool update?
This is often caused by overlays, semi-transparent elements, shadows, or platform composition changes, and not the layout. Check for visual layers above the CollectionView.
What is the most effective way to batch many updates into a single operation?
To batch many updates into a single operation, use ObservableRangeCollection.AddRange, suspend notifications, and raise one Reset event, or replace the entire ItemsSource. This reduces repeated rebind and remeasurement.
When an item changes, is it better to raise PropertyChanged or replace the item? Why might the interface fail to update?
It is preferable to use PropertyChanged to address this issue. Replacing items triggers the CollectionChange event and may cause container recycling or state loss. The interface fails to update when the property does not raise change notifications.
Is it better to bind CollectionView to domain models or lightweight item view models?
It is better to use lightweight item view models implementing INotifyPropertyChanged. They provide predictable UI updates, support local UI state, and keep domain models free of UI responsibilities.