Apple's main announcement this evening at its annual developer conference was iOS 13, the next version of its mobile platform, which is due to be released this fall alongside the new iPhones. As rumored, iOS 13 gets a Dark Mode which you can enable if you've had enough of Apple's white UIs throughout the OS. The Dark Mode isn't necessarily going to be true black in all apps, but all of Apple's built-in apps should support it automatically. If your iPhone has an OLED screen, using the Dark Mode has the potential to extend your battery life, at least somewhat. Dark Mode iOS 13...