If you can open source the code in this video, it will be a great help for learning this interface
Eriice
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
The mini demo as follow.
struct home: View {
		@State var 😄 = false
		var body: some View {
				// '$' is not an identifier; use backticks to escape it
				// Cannot find '$' in scope
				FooView(bar: $😄)
		}
}
struct FooView: View {
@Binding var bar: Bool
	// ...
}
That would be normal when use ASCII character to replace emoji.