Reboot, Respring, Shutdown Icon buttons on Homescreen
iOS on the iPhone or on any other iOS device does not provide you home screen icons to perform reboot or respring operations. Fortunately, there is a jailbreak tweak for that. To get those icons on the homescreen, all you have to do is download a tweak called PowerIcons.
Simply open Cydia and search for powericons. After installing it, you will find four icons on your homscreen – shutdown, respring, reboot and safe mode.