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IslandGuideSample

This app was originally created as a demo app for a workshop that I instructed in 2019.

These days this project is a fully working example of UICompositionalCollectionViewLayout and NSDiffableDataSource powering a dynamic multi-section collection view.

I keep referring to this project myself whenever I want to remember how to get the full setup going, or if I hit an obscure bug that shouldn't be happening.

Feel free to fork the project and make your own changes. If you notice a bug or just code that can be improved, PRs are welcome 💛

About

Demo app for Collection Views workshop @ Swift Island 2019. Slides: SpeakerDeck.

Created by Marina Gornostaeva.

the demo

During the workshop we went through refactoring of this app from using classic UICollectionViewDataSource and UICollectionViewFlowLayout to using the new diffable data source and compositional layout.

The steps below can be checked out from separate branches in this repo.

Part 1: Diffable Data Source

  1. Simple data source
  2. Creating and updating data in different ways

Part 2: Compositional layout

  1. Basic concepts of compositional layout
  2. Trying out nested groups and using estimated height

Optional excercises

  • Different layout for different size classes
  • Section inset based on system layout margins
  • Supplementary views, headers

After the workshop

WWDC 2019 has two great sessions that go in depth into the new compositional layout and diffable data source.

Advances in Collection View Layout

Advances in UI Data Sources

About

A sample app with a dynamic multi-section collection view powered by NSDiffableDataSource and UICollectionViewCompositionalLayout

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