[ios] fix compass font thinner than previous version on iOS 13

platform/ios/CHANGELOG.md

@@ -8,7 +8,8 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * 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))
- * Enable using of `text-offset` option together with `text-variable-anchor` (if `text-radial-offset` option is not provided). If used with `text-variable-anchor`, input values will be taken as absolute values. Offsets along the x- and y-axis will be applied automatically based on the anchor position. ([#15542](https://github.com/mapbox/mapbox-gl-native/pull/15542))
+* Enable using of `text-offset` option together with `text-variable-anchor` (if `text-radial-offset` option is not provided). If used with `text-variable-anchor`, input values will be taken as absolute values. Offsets along the x- and y-axis will be applied automatically based on the anchor position. ([#15542](https://github.com/mapbox/mapbox-gl-native/pull/15542))
+* Fixed an issue with the appearance of the compass text in iOS 13. ([#15547](https://github.com/mapbox/mapbox-gl-native/pull/15547))
 
  ### Performance improvements
 

platform/ios/src/MGLCompassButton.mm

@@ -63,9 +63,16 @@ - (UIImage *)compassImage {
     UIImage *scaleImage = [UIImage mgl_resourceImageNamed:@"Compass"];
     UIGraphicsBeginImageContextWithOptions(scaleImage.size, NO, UIScreen.mainScreen.scale);
     [scaleImage drawInRect:{CGPointZero, scaleImage.size}];
+
+    UIFont *northFont;
+    if (@available(iOS 13.0, *)) {
+        northFont = [UIFont systemFontOfSize:11 weight:UIFontWeightLight];
+    } else {
+        northFont = [UIFont systemFontOfSize:11 weight:UIFontWeightUltraLight];
+    }
 
     NSAttributedString *north = [[NSAttributedString alloc] initWithString:NSLocalizedStringWithDefaultValue(@"COMPASS_NORTH", nil, nil, @"N", @"Compass abbreviation for north") attributes:@{
-        NSFontAttributeName: [UIFont systemFontOfSize:11 weight:UIFontWeightUltraLight],
+        NSFontAttributeName: northFont,
         NSForegroundColorAttributeName: [UIColor whiteColor],
     }];
     CGRect stringRect = CGRectMake((scaleImage.size.width - north.size.width) / 2,