We have NSWorkspaceWillPowerOffNotification raised when a mac system is about to shutdown.
Is there a counterpart of it for iOS device? Can we register to something similar to get notified when the device is about to be powered off?
What is the power off notification for iOS?
AFAIK there is no such notification.
When you turn off with the slider, all data are saved:
h t t p s : / / smallbusiness.chron.com/lose-everything-reboot-iphone-68121.html