[ios] Allow MGLScaleBar to support dark mode on iOS 13

platform/ios/CHANGELOG.md

@@ -7,6 +7,7 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * Fixed an issue that caused the tilt gesture to trigger too easily and conflict with pinch or pan gestures. ([#15349](https://github.com/mapbox/mapbox-gl-native/pull/15349))
 * Fixed a bug with annotation view positions after camera transitions. ([#15122](https://github.com/mapbox/mapbox-gl-native/pull/15122/))
 * Fixed a rendering issue of `collisionBox` when `text-translate` or `icon-translate` is enabled. ([#15467](https://github.com/mapbox/mapbox-gl-native/pull/15467))
+* Fixed an issue where the scale bar text would become illegible if iOS 13 dark mode was enabled. ([#15524](https://github.com/mapbox/mapbox-gl-native/pull/15524))
 
  ### Performance improvements
 

platform/ios/src/MGLScaleBar.mm

@@ -101,7 +101,6 @@ @implementation MGLScaleBarLabel
 
 - (void)drawTextInRect:(CGRect)rect {
     CGSize shadowOffset = self.shadowOffset;
-    UIColor *textColor = self.textColor;
 
     CGContextRef context = UIGraphicsGetCurrentContext();
     CGContextSetLineWidth(context, 2);
@@ -112,7 +111,7 @@ - (void)drawTextInRect:(CGRect)rect {
     [super drawTextInRect:rect];
 
     CGContextSetTextDrawingMode(context, kCGTextFill);
-    self.textColor = textColor;
+    self.textColor = [UIColor blackColor];
     self.shadowOffset = CGSizeMake(0, 0);
     [super drawTextInRect:rect];