[ios] Add MGLMapView.showsScale to control scale bar visibility (#11335)

- Fixes scale bar not being visible until a camera change event.
- Adds IBInspectable for scale bar visibility.
- Add tests of the scale bar being added to the map view

1 files changed, 3 insertions, 2 deletions

diff --git a/platform/ios/test/MGLMapViewLayoutTests.m b/platform/ios/test/MGLMapViewLayoutTests.m
index e707cfdb41..16f6cdada3 100644
--- a/platform/ios/test/MGLMapViewLayoutTests.m
+++ b/platform/ios/test/MGLMapViewLayoutTests.m
@@ -37,14 +37,15 @@
     self.styleLoadingExpectation = [self expectationWithDescription:@"Map view should finish loading style."];
     [self waitForExpectationsWithTimeout:1 handler:nil];
 
+    self.mapView.showsScale = YES;
+
     //set zoom and heading so that scale bar and compass will be shown
-    [self.mapView setZoomLevel:4.5 animated:NO];
+    [self.mapView setZoomLevel:10.0 animated:NO];
     [self.mapView.camera setHeading:12.0];
 
     //invoke layout
     [self.superView setNeedsLayout];
     [self.superView layoutIfNeeded];
-
 }
 
 - (void)mapView:(MGLMapView *)mapView didFinishLoadingStyle:(MGLStyle *)style {