The next upcoming version of Apple's mobile device OS has finally been released at WWDC 2019. It brings the long-awaited Dark Mode, in addition to improvements for many other iOS features and functions. They include a 'new' swipe keyboard, faster app launch times and Sign in with Apple.
https://www.notebookcheck.net/iOS-13-officially-lives-Dark-Mode-30-faster-Face-ID-new-keyboard-it-s-all-here.423044.0.html