CollectionView how to work

To work with a CollectionView in SwiftUI, you can use the List or ForEach views to iterate over a collection of data and create views for each element. This approach allows you to build complex UI structures by composing views. Here's a brief overview based on the content from the WWDC sessions:

1. List and ForEach: In SwiftUI, a List can be initialized with a collection parameter, which is a convenience for creating a ForEach view. The ForEach view generates views for each element in a collection and provides those to its container. This allows for creating advanced constructions, such as multiple collections of data organized into sections. You can customize lists using view modifiers, such as adding swipe actions to each row. This is discussed in the SwiftUI essentials session.

2. Custom Views: You can create custom views that conform to the View protocol and have a body property to return the view it represents. This enables compositional features and quick iteration. Custom views can be used like any other view and can have inputs that change how their body is created, allowing for reuse across different data sets. This is also covered in the SwiftUI essentials session.

3. Sections: If you need to organize your data into sections, you can use the Section view in SwiftUI. A Section view behaves much like a Group view but with extra section-specific metadata, such as optional headers and footers. This is explained in the Demystify SwiftUI containers session.

These sessions provide a comprehensive guide on how to effectively use collection views and related components in SwiftUI.