[ios, macos] Mark MGLStyleLayer properties null_resettable

If the property is unset, return the default value.

Fixes #6126.

1 files changed, 5 insertions, 5 deletions

diff --git a/platform/darwin/src/MGLBackgroundStyleLayer.h b/platform/darwin/src/MGLBackgroundStyleLayer.h
index 43802bc250..3fbd7e3869 100644
--- a/platform/darwin/src/MGLBackgroundStyleLayer.h
+++ b/platform/darwin/src/MGLBackgroundStyleLayer.h
@@ -13,23 +13,23 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  The color with which the background will be drawn.
  
- If this property is set to `nil`, the layer uses an implicit default value of `blackColor`.
+ The default value of this property is `blackColor`. Set this property to `nil` to reset it to the default value.
 
  This property is only applied to the style if `backgroundPattern` is set to `nil`. Otherwise, it is ignored.
  */
-@property (nonatomic, nullable) id <MGLStyleAttributeValue> backgroundColor;
+@property (nonatomic, null_resettable) id <MGLStyleAttributeValue> backgroundColor;
 
 /**
  Name of image in sprite to use for drawing an image background. For seamless patterns, image width and height must be a factor of two (2, 4, 8, ..., 512).
  */
-@property (nonatomic, nullable) id <MGLStyleAttributeValue> backgroundPattern;
+@property (nonatomic, null_resettable) id <MGLStyleAttributeValue> backgroundPattern;
 
 /**
  The opacity at which the background will be drawn.
  
- If this property is set to `nil`, the layer uses an implicit default value of `1`.
+ The default value of this property is `1`. Set this property to `nil` to reset it to the default value.
  */
-@property (nonatomic, nullable) id <MGLStyleAttributeValue> backgroundOpacity;
+@property (nonatomic, null_resettable) id <MGLStyleAttributeValue> backgroundOpacity;
 
 @end