It has been rumored for some time that Apple was working on a dark mode for iOS 13, an addition long awaited by users.
Dark mode on iOS 13
According to Bloomberg, this mode should indeed see the light of day with the next version of iOS, which will be presented next June at WWDC 2019 if Apple sticks to its usual program. This innovation will take place several months after the arrival of dark mode on macOS.
The dark mode will aim to provide better comfort of use in low light and thus darken the colors aggressive to the eyes. Several iOS apps already offer it, but not native Apple apps.