Add Screen Brightness Control to Your iPhone with App Switcher Brightness
A new amazing Cydia tweak called App Switcher Brightness, allows you to add brightness slider to the now playing bar in multitasking tray. It controls the brightness simply as you just have to double press the home button to launch the app switcher instead of going to native brightness menu.
One last point to know that it does make a conflict with the App Switcher volume tweak, so if you have App Switcher volume installed on your device, you should uninstall it before using this tweak. App Switcher Brightness is now available via the BigBoss repo and being sold for $0.99.
To enjoy this app, your device must be jailbroken, you can follow our guide posted here to jailbreak your iOS device using Limera1n.