SBLockScreenViewController is the controller representing the lockscreen. It hosts an SBLockScreenView. Available in iOS 7+.
Examples
Accessing SBLockScreenViewController's SBLockScreenView
SBLockScreenManager *manager = [%c(SBLockScreenManager) sharedInstance];
SBLockScreenViewController *lockScreenViewController = [manager lockScreenViewController];
SBLockScreenView *lockScreenView = [lockScreenViewController lockScreenView];
References