A heavily requested feature for iOS 11 was Dark Mode. Dark Mode essentially turns white space black while leaving media, photos, and content the same. However, we did not get an official Dark Mode in iOS 11, and we haven't gotten one for iOS 12, either. Hopefully this will come out soon because macOS Mojave does offer this feature. For now, though, the next best thing is pretty darn fantastic. Inverting colors on iPhone in the past meant distorting the look of photos and content as well. But iOS 11 introduced Smart Invert, which is (almost) as good of a Dark Mode as we need. Here’s how to turn on Dark Mode or Night Mode in iOS 12 on iPhone, this will invert colors on your display and reduce eye strain.