https://techcrunch.com/2019/05/28/leaked-screenshots-confirm-dark-mode-is-coming-to-ios-13/

9to5mac’s Guilherme Rambo managed to obtain screenshots of iOS 13. While it still looks like iOS, there’s a twist — there will be a system-wide dark mode to make your apps look better at night. Apple is expected to announce the new version of iOS at its WWDC keynote on Monday.

With iOS 13, users can enable dark mode in the Settings app or with a toggle in Control Center — you may have to add the Control Center button in the Settings app first.