How do I built a custom container view with SwiftUI

To build a custom container view with SwiftUI, you can follow the guidance provided in the session "Demystify SwiftUI containers" from WWDC 2024. Here are the key steps and concepts:

1. Understanding Composition:

   • SwiftUI containers use a trailing ViewBuilder closure to wrap their content. This allows you to define content either statically or dynamically.
   • You can use containers like List and ForEach to compose different kinds of content together.
   • Example: A List can be initialized with a collection of data or by manually writing out a set of views.

2. Creating Custom Containers:

   • Start by making your custom container support any composition of content to maximize flexibility.
   • Example: You can create a custom card view and make your container more flexible by adding support for more kinds of composition in its content.

3. Adding Support for Sections:

   • Custom containers can be enhanced to support sections, similar to how List supports sections using SwiftUI's Section view.
   • Example: You can create separate sections for different categories within your custom container.

4. Custom Modifiers:

   • Use container-specific modifiers to customize content within your container.
   • Example: You can define custom view modifiers using the new container values API to add specific behaviors or styles to the content within your container.

5. Implementing Custom Modifiers:

   • Define a new kind of container value using an extension on the ContainerValues type.
   • Use the new entry macro to add new values to SwiftUI's keyed storage types.
   • Create a custom view modifier to set your property and apply it within your container.

For a detailed walkthrough, you can refer to the session "Demystify SwiftUI containers" at the following timestamps:

• Introduction
• Composition
• Sections
• Customization

These chapters will provide you with a comprehensive understanding and practical examples of building custom container views in SwiftUI.