LazyCollection

A minimal SwiftUI lazy container type, that:

• uses UICollectionView underneath and supports any self-sizing UICollectionViewLayout you throwing at it;
• can be used on iOS 13.0+ and substituted the sometimes wonky LazyVStack; and
• does not support sections as is, does not support drag-n-drop, and does not support multiple selections.

There is no commitment to a feature roadmap. Feel free to copy & paste into your own codebase, and evolve/fork it on your own terms.

Sources/Private/Previews.swift contains a SwiftUI Preview showcasing LazyCollection in a grid format, powered by UICollectionViewCompositionalLayout. One thing worth noting that is also showcased is that LazyCollection supports two ways of item selection:

1. a Data.Element.ID? binding which you point to a @State variable; or

2. using a SwiftUI.Button at the root of your ItemContent view, akin to the vanilla usage of SwiftUI.List.

   This is made possible by LazyCollection always providing an ambient PrimitiveButtonStyle, that will trigger the SwiftUI action closure in response to UICollectionView selection, and then subsequently auto-deselect the item. Note that auto-deselection is disabled if you use a binding (1).

Acknowledgements

• Samuel Défago's blog post series
• ASCollectionView — a more fully featured package.