In iOS 7 redesign, you observe the ON switch is represented with green colour, and OFF switch with white colour for different Settings. Unlike the iOS 6, iOS 7 also gives option to the users to add extra indicator to the ON/OFF switches, in case its your preference or need due to any disability. So, follow steps below to change On/Off Labels settings in iOS 7.
Enable ON/OFF Switch Labels in iOS 7
Tap on “Settings” > “General” > “Accessibility”
Scroll down to the option “On/Off Labels” and then tap on its slider to apply the indicator
This extra visual view is handy enough for the toggle switches of applications in iOS 7. And the On/Off Labels settings selected by a user will work for system-wide on iOS 7.