Apple launched iOS 7.1 and with it a major, game-changing improvement to iBeacon.
With iOS 7.1 your application will listen for beacons even if it was hard closed. The user can still opt out by turning off “location permission” under settings, can turn Bluetooth off, or can delete your app entirely.
After opening an iBeacon app we hard closed it: not just putting it into the background tray but swiping it closed entirely. The phone still detected beacons and sent a message through the lock screen, something which in the past was reserved for apps that were at minimum running in the background tray.
The functionality even works if you reboot your device: after you power down your phone and start it up again, it will continue listening for beacons even if you don’t open up the app again.