https://techcrunch.com/2019/06/03/apples-ios-13-will-include-a-system-wide-dark-mode/

Apple’s iOS 13 is getting a dark mode, the company announced today at its Worldwide Developers Conference in San Jose. Confirming an earlier leak, the new dark mode will be system-wide and can be turned on or off from iOS’s Settings or through a new Control Center toggle. Once enabled, Dark Mode will change the color of the Home screen dock, the background colors of iOS screens, and Apple’s built-in apps like Apple Music, Notes, Messages, Photos, Calendar, Music, and more.

Other system features have also been prepped for dark mode like the dock and share sheet, so it’s a seamless experience.