Switch to night style when Dark Mode is enabled (#4143)

* Initial implementation.

* Transition whenever mode changes and remove print statements.

* Add public property to safe guard logic.

* Update changelog and remove availability statements.

* Set usesNightStyleInDarkMode to false by default.

* Make usesNightStyleInDarkMode documentation more clear.

Author: jill-cardamon

CHANGELOG.md

@@ -36,6 +36,7 @@
 * Added the `NavigationViewControllerDelegate.navigationViewController(_:didSelect:)` and `NavigationViewControllerDelegate.navigationViewController(_:didSelect:)` methods that allow selection of the waypoint and continuous alternative. ([#4175](https://github.com/mapbox/mapbox-navigation-ios/pull/4175))
 * MapboxMobileEvents dependency is replaced with CoreTelemetry (part of MapboxCommon). ([#4011](https://github.com/mapbox/mapbox-navigation-ios/pull/4011))
 * Deprecated `NavigationEventsManager.init(activeNavigationDataSource:passiveNavigationDataSource:accessToken:mobileEventsManager:)` in favour of `NavigationEventsManager.init(activeNavigationDataSource:passiveNavigationDataSource:accessToken:)`. ([#4011](https://github.com/mapbox/mapbox-navigation-ios/pull/4011))
+* Added `NavigationViewController.usesNightStyleInDarkMode` property to control whether night style is used in dark mode. ([#4143](https://github.com/mapbox/mapbox-navigation-ios/pull/4143))
 
 ## v2.8.1
 

Sources/MapboxNavigation/NavigationViewController.swift

@@ -444,6 +444,10 @@ open class NavigationViewController: UIViewController, NavigationStatusPresenter
         setupNavigationService()
         setupVoiceController()
         setupNavigationCamera()
+        
+        if usesNightStyleInDarkMode && self.traitCollection.userInterfaceStyle == .dark {
+            styleManager.applyStyle(type: .night)
+        }
     }
 
     open override func viewWillAppear(_ animated: Bool) {
@@ -456,6 +460,12 @@ open class NavigationViewController: UIViewController, NavigationStatusPresenter
         notifyUserAboutLowVolumeIfNeeded()
     }
 
+    override open func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+        if usesNightStyleInDarkMode {
+            transitionStyle(to: newCollection)
+        }
+    }
+    
     func notifyUserAboutLowVolumeIfNeeded() {
         guard !(navigationService.locationManager is SimulatedLocationManager) else { return }
         guard !NavigationSettings.shared.voiceMuted else { return }
@@ -791,6 +801,11 @@ open class NavigationViewController: UIViewController, NavigationStatusPresenter
      */
     public var waypointStyle: WaypointStyle = .annotation
 
+    /**
+     Controls whether night style will be used whenever dark mode is enabled. Defaults to `false`.
+     */
+    public var usesNightStyleInDarkMode: Bool = false
+    
     var approachingDestinationThreshold: CLLocationDistance = DefaultApproachingDestinationThresholdDistance
     var passedApproachingDestinationThreshold: Bool = false
     var currentLeg: RouteLeg?
@@ -820,6 +835,14 @@ open class NavigationViewController: UIViewController, NavigationStatusPresenter
             return currentStatusBarStyle
         }
     }
+    
+    func transitionStyle(to newCollection: UITraitCollection) {
+        if newCollection.userInterfaceStyle == .dark {
+            styleManager.applyStyle(type: .night)
+        } else {
+            styleManager.applyStyle(type: .day)
+        }
+    }
 }
 
 // MARK: - NavigationViewDelegate methods