According to ios11, I'll review the new version of Apple, ios12, which makes mistakes more stable and makes the devices more stable. Of course, new features have been added.
Reference: https://www.apple.com/ios/ios-12/
For example, "Do Not Disturb" feature will no longer disturb users at night. A completely dark screen is provided so that you are not disturbed by notifications and your phone's light does not distract you. Part of the "Always-On Screen" feature seems to have arrived here.
Reference: http://www.iphonehacks.com/2018/06/how-use-enhanced-do-not-disturb-ios-12.html
Another is the digital health feature. You can specify times such as "Downtime" and "App Limits" from the "Screen Time" tab of "Settings". You can keep track of the time you have spent with your phone or tablet with this feature. You can set the application usage time for yourself or your child if you want.
Reference: http://www.iphonehacks.com/2018/06/how-use-enhanced-do-not-disturb-ios-12.html