Expose heading and missing geolocation properties

Libraries/Geolocation/Geolocation.js

@@ -22,6 +22,7 @@ const LocationEventEmitter = new NativeEventEmitter(RCTLocationObserver);
 
 var subscriptions = [];
 var updatesEnabled = false;
+var headingUpdatesEnabled = false;
 
 type GeoOptions = {
   timeout: number,
@@ -141,6 +142,37 @@ var Geolocation = {
       }
       subscriptions = [];
     }
+  },
+
+  /*
+   * Invokes the update callback whenever the location heading changes. 
+   */
+  startUpdatingHeading: function(update: Function) {
+    if (headingUpdatesEnabled) {
+      warning('Called startUpdatingHeading while currently updating heading.');
+    }
+
+    RCTLocationObserver.startUpdatingHeading();
+    headingUpdatesEnabled = true;
+
+    LocationEventEmitter.addListener(
+      'headingDidChange',
+      update
+    );
+  },
+
+  /*
+   * Stops observing a location heading.
+   */
+  stopUpdatingHeading: function() {
+    if (!headingUpdatesEnabled) {
+        warning('Called stopUpdatingHeading without currently updating heading.')
+    }
+
+    RCTLocationObserver.stopUpdatingHeading();
+    headingUpdatesEnabled = false;
+
+    LocationEventEmitter.remove('headingDidChange');
   }
 };
 

Libraries/Geolocation/RCTLocationObserver.m

@@ -12,6 +12,7 @@
 #import <CoreLocation/CLError.h>
 #import <CoreLocation/CLLocationManager.h>
 #import <CoreLocation/CLLocationManagerDelegate.h>
+#import <CoreLocation/CLHeading.h>
 
 #import <React/RCTAssert.h>
 #import <React/RCTBridge.h>
@@ -108,6 +109,7 @@ @implementation RCTLocationObserver
   NSDictionary<NSString *, id> *_lastLocationEvent;
   NSMutableArray<RCTLocationRequest *> *_pendingRequests;
   BOOL _observingLocation;
+  BOOL _observingHeading;
   RCTLocationOptions _observerOptions;
 }
 
@@ -128,7 +130,7 @@ - (dispatch_queue_t)methodQueue
 
 - (NSArray<NSString *> *)supportedEvents
 {
-  return @[@"geolocationDidChange", @"geolocationError"];
+  return @[@"geolocationDidChange", @"geolocationError", @"headingDidChange"];
 }
 
 #pragma mark - Private API
@@ -267,6 +269,27 @@ - (void)timeout:(NSTimer *)timer
   [self beginLocationUpdatesWithDesiredAccuracy:accuracy distanceFilter:options.distanceFilter];
 }
 
+RCT_EXPORT_METHOD(startUpdatingHeading)
+{
+  if (!_locationManager) {
+    _locationManager = [CLLocationManager new];
+    _locationManager.delegate = self;
+  }
+
+  [_locationManager startUpdatingHeading];
+  _observingHeading = YES;
+}
+
+RCT_EXPORT_METHOD(stopUpdatingHeading)
+{
+  if (!_locationManager || !_observingHeading) {
+    RCTLogError(@"%@.stopUpdatingHeading called without starting to update.", [self class]);
+  }
+
+  [_locationManager stopUpdatingHeading];
+  _observingHeading = NO;
+}
+
 #pragma mark - CLLocationManagerDelegate
 
 - (void)locationManager:(CLLocationManager *)manager
@@ -283,6 +306,8 @@ - (void)locationManager:(CLLocationManager *)manager
       @"altitudeAccuracy": @(location.verticalAccuracy),
       @"heading": @(location.course),
       @"speed": @(location.speed),
+      @"course": @(location.course),
+      @"floorLevel": @(location.floor.level)
     },
     @"timestamp": @([location.timestamp timeIntervalSince1970] * 1000) // in ms
   };
@@ -347,6 +372,25 @@ - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *
   }
 }
 
+- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
+{
+  // Create event
+  NSDictionary *headingEvent = @{
+    @"heading": @{
+      @"magneticHeading": @(newHeading.magneticHeading),
+      @"trueHeading": @(newHeading.trueHeading),
+      @"headingAccuracy": @(newHeading.headingAccuracy),
+      @"x": @(newHeading.x),
+      @"y": @(newHeading.y)
+    }
+  };
+
+  // Send event
+  if (_observingHeading) {
+    [self sendEventWithName:@"headingDidChange" body:headingEvent];
+  }
+}
+
 static void checkLocationConfig()
 {
 #if RCT_DEV