[ios, macos] Convert NSColor/UIColor expressions to CSS color string values

When converting a constant NSExpression to an mbgl::Value, turn an NSColor or UIColor into an std::string containing a CSS color string. This allows developers to set an attribute of an MGLFeature to an NSColor or UIColor (rather than a CSS color string, which would be foreign), then use it in an MGLStyleFunction with identity interpolation.

1 files changed, 1 insertions, 0 deletions

diff --git a/platform/macos/CHANGELOG.md b/platform/macos/CHANGELOG.md
index 4738cc3b78..b00b0cee41 100644
--- a/platform/macos/CHANGELOG.md
+++ b/platform/macos/CHANGELOG.md
@@ -25,6 +25,7 @@
 * Fixed artifacts when drawing particularly acute line joins. ([#7786](https://github.com/mapbox/mapbox-gl-native/pull/7786))
 * Fixed an issue in which a vector style layer predicate involving the `$id` key path would exclude all features from the layer. ([#7989](https://github.com/mapbox/mapbox-gl-native/pull/7989), [#7971](https://github.com/mapbox/mapbox-gl-native/pull/7971))
 * Fixed an issue causing vector style layer predicates to be evaluated as if each feature had a `$type` attribute of 1, 2, or 3. The `$type` key path can now be compared to `Point`, `LineString`, or `Polygon`, as described in the documentation. ([#7971](https://github.com/mapbox/mapbox-gl-native/pull/7971))
+* When setting an `MGLShapeSource`’s shape to an `MGLFeature` instance, any `NSColor` attribute value is now converted to the equivalent CSS string representation for use with `MGLInterpolationModeIdentity` in style functions. ([#8025](https://github.com/mapbox/mapbox-gl-native/pull/8025))
 
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