iOS_近接センサー実装方法

- (void)viewWillAppear:(BOOL)animated
{
  [super viewWillAppear:animated];
	
	[self startSensor];
}

- (void)viewWillDisappear:(BOOL)animated
{
	[super viewWillDisappear:animated];
	
	[self stopSensor];
}

~~~ 省略 ~~~

#pragma mark - Proximity Sensor

- (void)startSensor
{
  [UIDevice currentDevice].proximityMonitoringEnabled = YES;
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(proximityStateDidChange:) name:UIDeviceProximityStateDidChangeNotification object:nil];
}

- (void)stopSensor
{
	[UIDevice currentDevice].proximityMonitoringEnabled = NO;
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceProximityStateDidChangeNotification object:nil];
}

/**
 * 画面消灯は近接センサをONにするだけで実装されている
 */
- (void)proximityStateDidChange:(NSNotification *)notification
{
	// センサに近づいたら
	if ([UIDevice currentDevice].proximityState == YES) {
	}
}