OC Category add property

To add a property in an Objective-C category, you can use the new entry macro introduced in SwiftUI. This macro provides a convenient syntax for adding new values to SwiftUI keyed storage types, including environment values, focus values, and more.

Here's a brief overview of how you can define a new kind of container value using the entry macro:

1. Create an Extension: Start by creating an extension on the container values type.
2. Declare a Property: Within the extension, declare a property using the new entry macro. This property can store any value, such as a boolean to track if a card has been rejected.
3. Custom View Modifier: Declare a custom view modifier as a convenience for setting your property. This modifier will call through to the new container value API modifier, passing the property's keypath and the new value to set.
4. Support in Container: Add support for your new container value within your container. Customize each view depending on the property value.

For more detailed information, you can refer to the session Demystify SwiftUI containers (14:45).

Relevant Sessions

1. Demystify SwiftUI containers
2. What’s new in SwiftUI

These sessions provide insights into the new entry macro and how to use it effectively in SwiftUI.