2 files changed, 29 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLStyle.mm b/platform/darwin/src/MGLStyle.mm
index 1e0a2e02b7..8c72c19e42 100644
--- a/platform/darwin/src/MGLStyle.mm
+++ b/platform/darwin/src/MGLStyle.mm
@@ -743,6 +743,32 @@ static NSURL *MGLStyleURL_emerald;
 
         self.localizedLayersByIdentifier = [NSMutableDictionary dictionary];
     }
+    [self setPreferredContentSize:nil];
+}
+
+- (void)setPreferredContentSize:(UIContentSizeCategory)preferredContentSize
+{
+    for (MGLSymbolStyleLayer *layer in self.layers) {
+        if (![layer isKindOfClass:[MGLSymbolStyleLayer class]]) {
+            continue;
+        }
+        
+        MGLVectorSource *source = (MGLVectorSource *)[self sourceWithIdentifier:layer.sourceIdentifier];
+        if (![source isKindOfClass:[MGLVectorSource class]] || !source.mapboxStreets) {
+            continue;
+        }
+
+        if ([layer.textFontSize isKindOfClass:[MGLConstantStyleValue class]]) {
+            NSNumber *textFontSize = [(MGLConstantStyleValue<NSNumber *> *)layer.textFontSize rawValue];
+            textFontSize = [NSNumber numberWithFloat:(textFontSize.floatValue * [self sizeForContentSizeCategory:preferredContentSize])];
+            layer.textFontSize = [MGLStyleValue<NSNumber *> valueWithRawValue:textFontSize];
+        }
+    }
+}
+
+- (CGFloat)sizeForContentSizeCategory:(UIContentSizeCategory)preferredContentSize
+{
+    return 1.3;
 }
 
 @end
diff --git a/platform/darwin/src/MGLStyle_Private.h b/platform/darwin/src/MGLStyle_Private.h
index 23ce8fbee0..6b96540272 100644
--- a/platform/darwin/src/MGLStyle_Private.h
+++ b/platform/darwin/src/MGLStyle_Private.h
@@ -1,4 +1,5 @@
 #import "MGLStyle.h"
+#import <UIKit/UIContentSizeCategory.h>
 
 #import "MGLStyleLayer.h"
 #import "MGLFillStyleLayer.h"
@@ -21,6 +22,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)setStyleClasses:(NS_ARRAY_OF(NSString *) *)appliedClasses transitionDuration:(NSTimeInterval)transitionDuration;
 
+- (void)setPreferredContentSize:(UIContentSizeCategory)preferredContentSize;
+
 @end
 
 NS_ASSUME_NONNULL_END