I know how to prevent using swipe to dismiss a modal sheet with .interactiveDismissDisabled(), and I know how to programmatically dismiss a sheet with the dismiss action.

But what I really want is to intercept the user swipe to present a confirmation dialog if they've made edits that need to be saved.

You can experience this in the iOS Calendar app: Go to create a new calendar entry, set the title, and then swipe to dismiss the sheet. It starts to animate down before springing back up as a confirmation alert appears.

Is this even possible in SwiftUI? All my googling just turns up the above two issues.