Hey guys,My iOS application has an extension that detects device Unlock and Lock event. I found 2 separate API to detect. Both of them work great.But my code is rejected twice by Apple Review Team. The following reason was to reject our binary.From AppleGuideline 2.5.1 - Performance - Software RequirementsYour app uses or references the following non-public APIs:com.apple.springboard.lockcompletecom.apple.springboard.lockstate1. First solution to detect device lock and unlock-----------------------------------Code Starts here-----------------------------------#import <notify.h> int notify_token; notify_register_dispatch("com.apple.springboard.lockstate", ¬ify_token, dispatch_get_main_queue(), ^(int token) { uint64_t state = UINT64_MAX; notify_get_state(token, &state); if(state == 0) { self->lastActiveDate = [NSDate date]; self->deviceCurrentState = _DEVICE_LOCK_STATE_UNLOCKED; } else { self->deviceCurrentState = _DEVICE_LOCK_STATE_LOCKED; } } );-----------------------------------End of Code-----------------------------------2. Second solution to detect device lock and unlock-----------------------------------Code Starts here------------------------------------(void)registerforDeviceLockNotif { //Screen lock notifications CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center CFBridgingRetain(self), // observer displayStatusChanged, // callback CFSTR("com.apple.springboard.lockcomplete"), // event name NULL, // object CFNotificationSuspensionBehaviorDeliverImmediately); CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center CFBridgingRetain(self), // observer displayStatusChanged, // callback CFSTR("com.apple.springboard.lockstate"), // event name NULL, // object CFNotificationSuspensionBehaviorDeliverImmediately); } - (void)removeDeviceLockNotif { CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), CFBridgingRetain(self), CFSTR("com.apple.springboard.lockstate"), nil); CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), CFBridgingRetain(self), CFSTR("com.apple.springboard.lockcomplete"), nil); }-----------------------------------End of Code-----------------------------------Since we are unable above 2 part of codes, what solution or what API we would use to detect device lock and unlock events? Thank you.