The Conversation (0)
This is iOS 7. Note that the control center icons (like Wifi, Bluetooth, etc) are black when disabled and white when enabled.
This is iOS 8. Note the control center icons have a different enable/disable state. When you select Wifi, Bluetooth, etc the background turns white. It's much easier to tell what's selected now!
This is iOS 7. Note that the Notification Center has 3 tabs.
This is iOS 8. Note that the Notification Center has only 2 tabs.