Add toggle in iosapp for custom user location annotation

platform/ios/app/MBXViewController.m

@@ -43,6 +43,7 @@ @interface MBXViewController () <UIActionSheetDelegate, MGLMapViewDelegate>
 @property (nonatomic) IBOutlet MGLMapView *mapView;
 @property (nonatomic) NSInteger styleIndex;
 @property (nonatomic) BOOL debugLoggingEnabled;
+@property (nonatomic) BOOL customUserLocationAnnnotationEnabled;
 
 @end
 
@@ -202,7 +203,10 @@ - (IBAction)showSettings:(__unused id)sender
  @"Start World Tour",
  @"Add Custom Callout Point",
  @"Remove Annotations",
- @"Runtime styling",
+ @"Runtime Styling",
+ ((_customUserLocationAnnnotationEnabled)
+ ? @"Disable Custom User Dot"
+ : @"Enable Custom User Dot"),
  nil];
 
  if (self.debugLoggingEnabled)
@@ -284,6 +288,12 @@ - (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSIn
  {
  [self testRuntimeStyling];
  }
+ else if (buttonIndex == actionSheet.firstOtherButtonIndex + 17)
+ {
+ _customUserLocationAnnnotationEnabled = !_customUserLocationAnnnotationEnabled;
+ self.mapView.showsUserLocation = NO;
+ self.mapView.userTrackingMode = MGLUserTrackingModeFollow;
+ }
  else if (buttonIndex == actionSheet.numberOfButtons - 2 && self.debugLoggingEnabled)
  {
  NSString *fileContents = [NSString stringWithContentsOfFile:[self telemetryDebugLogfilePath] encoding:NSUTF8StringEncoding error:nil];
@@ -702,9 +712,13 @@ - (MGLAnnotationView *)mapView:(MGLMapView *)mapView viewForAnnotation:(id<MGLAn
 {
  if (annotation == mapView.userLocation)
  {
- //MBXUserLocationAnnotationView *annotationView = [[MBXUserLocationAnnotationView alloc] initWithFrame:CGRectZero];
- //annotationView.frame = CGRectMake(0, 0, annotationView.intrinsicContentSize.width, annotationView.intrinsicContentSize.height);
- //return annotationView;
+ if (_customUserLocationAnnnotationEnabled)
+ {
+ MBXUserLocationAnnotationView *annotationView = [[MBXUserLocationAnnotationView alloc] initWithFrame:CGRectZero];
+ annotationView.frame = CGRectMake(0, 0, annotationView.intrinsicContentSize.width, annotationView.intrinsicContentSize.height);
+ return annotationView;
+ }
+
  return nil;
  }
  // Use GL backed pins for dropped pin annotations