I'm developing an app for virtual headset (cardboard).I want to detect when iphone has been enclosed in the cardboard by using the proximity sensor.Problems:once [[UIDevice currentDevice] proximityState] == YES the screen goes black, while I need to show images.the proximity notification is generated only in portrait mode. I need it (only) in landscape mode.Here my code:- (void)viewDidLoad { [super viewDidLoad]; [[UIDevice currentDevice] setProximityMonitoringEnabled:YES]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(proxSensorStateMonitor:) name:UIDeviceProximityStateDidChangeNotification object:nil]; [[UIApplication sharedApplication] setIdleTimerDisabled:YES]; } - (void)proxSensorStateMonitor:(NSNotificationCenter *)notification { if ([[UIDevice currentDevice] proximityState] == YES) { [[UIDevice currentDevice] setProximityMonitoringEnabled:NO]; // Provide content for Cardboard } }