Display location on map when authorised

ReactiveLocation.m

if ([CLLocationManager locationServicesEnabled]) {
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;

    RACSignal *locationAuthorizationStatus = [[RACSignal
        concat:@[
            [RACSignal return:@([CLLocationManager authorizationStatus])],
            [[self rac_signalForSelector:@selector(locationManager:didChangeAuthorizationStatus:) fromProtocol:@protocol(CLLocationManagerDelegate)] map:^id(RACTuple *arguments) {
                return arguments.second;
            }]
        ]]
        doNext:^(NSNumber *value) {
            if ([value intValue] == kCLAuthorizationStatusNotDetermined) {
              [self.locationManager requestWhenInUseAuthorization];
            }
        }
    ];

    RAC(self.mapView, showsUserLocation, @NO) = [locationAuthorizationStatus map:^id(NSNumber *value) {
        return @([value intValue] == kCLAuthorizationStatusAuthorizedWhenInUse);
    }];
}