On iOS 14.4.2, my observations are that:
- Theme=Black (as expected from name) will ignore system settings and provide an OLED dark theme.
-
Theme=Default:
- uses Gray for Dark mode
- doesn’t seem to change colors when I manually change System setting from Dark → Light, unless I restart the app.
Based on original feature request of adding OLED dark mode, I think that should be answered by existing Black theme.
The follow-up seems to be about adding a system theme shifting between Light + Black, which I don’t think exists.
Not too sure if the behavior I see where app colors don’t update without restart is normal. More iOS-specific apps like Safari and Dark Sky do support this.