Proximity sensor event not being fired

Hi,

I recently starting using this library with a project created with react native init. I manually linked the library per the instructions.

I noticed the proximity sensor functionality was not working as expected. After calling InCallManager.start(), the screen would not turn off when something was close to the sensor.

I checked the code in RNInCallManager.m and found the function for starting the proximity sensor, and noticed _currentDevice.proximityMonitoringEnabled set to NO:

- (void)startProximitySensor
{
    if (_isProximityRegistered) {
        return;
    }

    NSLog(@"RNInCallManager.startProximitySensor()");
    // _currentDevice.proximityMonitoringEnabled = YES;
    _currentDevice.proximityMonitoringEnabled = NO;
    
    // --- in case it didn't deallocate when ViewDidUnload
    [self stopObserve:_proximityObserver
                 name:UIDeviceProximityStateDidChangeNotification
               object:nil];

    _proximityObserver = [self startObserve:UIDeviceProximityStateDidChangeNotification
                                     object:_currentDevice
                                      queue: nil
                                      block:^(NSNotification *notification) {
        BOOL state = _currentDevice.proximityState;
        if (state != _proximityIsNear) {
            NSLog(@"RNInCallManager.UIDeviceProximityStateDidChangeNotification(): isNear: %@", state ? @"YES" : @"NO");
            _proximityIsNear = state;
            [self sendEventWithName:@"Proximity" body:@{@"isNear": state ? @YES : @NO}];
        }
    }];

    _isProximityRegistered = YES;
}

I uncommented the line setting it to YES and commented the line setting it to NO, and it starting working after rebuilding. However it now gives this warning:

-[UIApplication setExpectsFaceContact:inLandscape:] must be used from main thread only

I'm wondering if this is the actual fix or if I am missing something. Thanks!

Start in RNInCallManager.m at startProximitySensor and compare the proximityMonitoringEnabled settings described in the report. Reproduce the behavior after rebuilding the manually linked library, then verify that the proximity event fires without the reported main-thread warning.