[iOS][Navigation] displaySoftGradientForTraffic configuration. (#10880)

Author: ArtemStepuk

CHANGELOG.md

@@ -18,6 +18,10 @@
 
 * Fixed an issue where authentication route request parameters could be duplicated when using a custom `DirectionsOptions` subclass.
 
+### Map
+
+* Added the congestion configuration `CongestionColorsConfiguration.displaySoftGradientForTraffic` to customize if the color transition between traffic congestion changes should use a soft gradient appearance or abrupt color change. 
+
 ## 3.16.0-rc.1
 
 ### Packaging

Sources/MapboxNavigationCore/Map/Style/Congestion/CongestionConfiguration.swift

@@ -6,6 +6,9 @@ public struct CongestionConfiguration: Equatable, Sendable {
     public var colors: CongestionColorsConfiguration
     /// Range configuration for congestion.
     public var ranges: CongestionRangesConfiguration
+    /// Determines if the color transition between traffic congestion changes should use a soft gradient appearance
+    /// or abrupt color change.
+    public var displaySoftGradientForTraffic: Bool = true
 
     /// Default configuration.
     public static let `default` = CongestionConfiguration(

Sources/MapboxNavigationCore/Map/Style/NavigationMapStyleManager.swift

@@ -596,7 +596,7 @@ final class NavigationMapStyleManager {
         let mainRouteFeature = routes.mainRoute.route.routeLineMapFeatures(
             ids: .main,
             offset: 0,
-            isSoftGradient: true,
+            isSoftGradient: config.congestionConfiguration.displaySoftGradientForTraffic,
             isAlternative: false,
             config: config,
             featureProvider: featureProvider,
@@ -613,7 +613,7 @@ final class NavigationMapStyleManager {
                 if let alternativeRouteFeature = alternativeRoute.route.routeLineMapFeatures(
                     ids: .alternative(idx: idx),
                     offset: deviationOffset,
-                    isSoftGradient: true,
+                    isSoftGradient: config.congestionConfiguration.displaySoftGradientForTraffic,
                     isAlternative: true,
                     config: config,
                     featureProvider: featureProvider,