How to get user-defined start of week in Swift?

Question

I know that I can get the start of the week according to the user's locale by using Calendar.current.firstWeekday, but I can change the start of the week from the locale's default in Settings > Calendar > Start Week On.

How can I get the first weekday that's been selected in that pane? Or do I need to allow users to set this in my app?

Leopardi

That's the settings for "Calendar" app. You don't have to (or shouldn't) use the app settings. You can see Settings > Calendar > Start Week also respects system settings by default (Calendar.current.firstWeekday). – Cartouche