I want to display a banner notification with a dark background and light text. iOS naturally does this if the phone is using dark mode. However, in light mode, when I use WhatsApp, I noticed banners have a dark theme as long as they are displayed while the application is in the foreground.
How can I create something similar? I've been looking into using UNNotificationContentExtension. This seems to work for custom actions displayed via a long click. For example, when I set view.backgroundColor, this does not set the background color for the whole banner. It only does it for custom actions.
This isn't possible, since the system manages the creation of these alerts. This is probably restricted for consistent UI.