How do I use the new group container API in SwiftUI?

To use the new group container API in SwiftUI, you can refer to the session Demystify SwiftUI containers. This session covers how to build custom container views that support various capabilities, including grouping content.

Here are some key points from the session:

1. Introduction to Custom Containers:

   • SwiftUI provides many full-featured containers like List and Picker.
   • Custom containers can be built to support any composition of content, maximizing flexibility.

2. Group Subview API:

   • The group subview API allows a container to accept another view as input and resolve its subviews.
   • Instead of iterating over them one at a time, it passes back a collection of all resolved subviews.
   • This can be useful for operations like counting the number of subviews or configuring them based on their count.

3. Container Values:

   • Container values are a new kind of keyed storage, similar to environment values but scoped to their direct container.
   • They are useful for implementing container-specific customization options.

4. Entry Macro:

   • The entry macro provides a convenient syntax for adding new values to SwiftUI keyed storage types, including environment values and container values.

For a detailed walkthrough, you can start watching the session from the beginning or jump to specific sections like Composition and Customization.

Relevant Sessions

• Demystify SwiftUI containers
• What’s new in SwiftUI

These sessions will provide you with a comprehensive understanding of the new group container API and other related enhancements in SwiftUI.