[ios] Allow MGLScaleBar to support dark mode on iOS 13upstream/ios13-scale-bar

Add changelog PR link

2 files changed, 7 insertions, 0 deletions

diff --git a/platform/ios/CHANGELOG.md b/platform/ios/CHANGELOG.md
index fae5599439..12215210b0 100644
--- a/platform/ios/CHANGELOG.md
+++ b/platform/ios/CHANGELOG.md
@@ -6,6 +6,7 @@ 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 an issue where the scale bar would not update its text color when dark mode was enabled. ([#15524](https://github.com/mapbox/mapbox-gl-native/pull/15524))
 
  ### Performance improvements
  
diff --git a/platform/ios/src/MGLScaleBar.mm b/platform/ios/src/MGLScaleBar.mm
index 993852d8b9..1a29b1aa1c 100644
--- a/platform/ios/src/MGLScaleBar.mm
+++ b/platform/ios/src/MGLScaleBar.mm
@@ -102,6 +102,12 @@ static const CGFloat MGLFeetPerMeter = 3.28084;
 - (void)drawTextInRect:(CGRect)rect {
     CGSize shadowOffset = self.shadowOffset;
     UIColor *textColor = self.textColor;
+
+    if (@available(iOS 13.0, *)) {
+        if (UITraitCollection.currentTraitCollection.userInterfaceStyle == UIUserInterfaceStyleDark) {
+            textColor = UIColor.blackColor;
+        }
+    }
     
     CGContextRef context = UIGraphicsGetCurrentContext();
     CGContextSetLineWidth(context, 2);