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I have used GPS location updates in my application. I want to detect if the iOS device is in sleep mode so that I can turn off the GPS location updates and optimize the battery use. I have already tried pausesLocationupdates in iOS 6, but it does not work as desired. I want to turn off the GPS location updates as soon as the device goes to sleep mode. I want to detect the lock/unlock event in the device. Is there any way to achieve this functionality ? so far I got the darwin notifications as given below -(void)registerForall { //Screen lock notifications CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center NULL, // observer displayStatusChanged, // callback CFSTR("com.apple.iokit.hid.displayStatus"), // event name NULL, // object CFNotificationSuspensionBehaviorDeliverImmediately); CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center NULL, // observer displayStatusChanged, // callback CFSTR("com.apple.springboard.lockstate"), // event name NULL, // object CFNotificationSuspensionBehaviorDeliverImmediately); CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center NULL, // observer displayStatusChanged, // callback CFSTR("com.apple.springboard.hasBlankedScreen"), // event name NULL, // object CFNotificationSuspensionBehaviorDeliverImmediately); CFNotificationCenterAddObserver(CFNotifi

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