1 files changed, 19 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLSymbolStyleLayer.mm b/platform/darwin/src/MGLSymbolStyleLayer.mm
index 6d91bbe87f..e54a0b9a15 100644
--- a/platform/darwin/src/MGLSymbolStyleLayer.mm
+++ b/platform/darwin/src/MGLSymbolStyleLayer.mm
@@ -54,6 +54,7 @@ namespace mbgl {
     });
 
     MBGL_DEFINE_ENUM(MGLSymbolZOrder, {
+        { MGLSymbolZOrderAuto, "auto" },
         { MGLSymbolZOrderViewportY, "viewport-y" },
         { MGLSymbolZOrderSource, "source" },
     });
@@ -587,6 +588,24 @@ namespace mbgl {
     return MGLStyleValueTransformer<mbgl::style::SymbolPlacementType, NSValue *, mbgl::style::SymbolPlacementType, MGLSymbolPlacement>().toExpression(propertyValue);
 }
 
+- (void)setSymbolSortKey:(NSExpression *)symbolSortKey {
+    MGLAssertStyleLayerIsValid();
+    MGLLogDebug(@"Setting symbolSortKey: %@", symbolSortKey);
+
+    auto mbglValue = MGLStyleValueTransformer<float, NSNumber *>().toPropertyValue<mbgl::style::PropertyValue<float>>(symbolSortKey, true);
+    self.rawLayer->setSymbolSortKey(mbglValue);
+}
+
+- (NSExpression *)symbolSortKey {
+    MGLAssertStyleLayerIsValid();
+
+    auto propertyValue = self.rawLayer->getSymbolSortKey();
+    if (propertyValue.isUndefined()) {
+        propertyValue = self.rawLayer->getDefaultSymbolSortKey();
+    }
+    return MGLStyleValueTransformer<float, NSNumber *>().toExpression(propertyValue);
+}
+
 - (void)setSymbolSpacing:(NSExpression *)symbolSpacing {
     MGLAssertStyleLayerIsValid();
     MGLLogDebug(@"Setting symbolSpacing: %@", symbolSpacing);