Fixed the delay on camera changes. (#9082)

Author: ArtemStepuk

CHANGELOG.md

@@ -32,6 +32,7 @@
 
 * Fixed an issue where the user interface did not necessarily display distances in the same measurement system as the requested route by default.
 * Fixed the fallback to the `RouteOptions.locale` for on-device speech synthesizing if the Mapbox Voice API does not support the requested language.
+* Fixed the delay on camera changes during heading updates with using the walking routing profile.
 
 ### Packaging
 

Sources/MapboxNavigationCore/Map/Camera/NavigationCamera.swift

@@ -85,7 +85,7 @@ public class NavigationCamera {
         observe(viewportDataSource: self.viewportDataSource)
 
         _states
-            .debounce(for: 0.2, scheduler: DispatchQueue.main)
+            .throttle(for: 0.2, scheduler: DispatchQueue.main, latest: true)
             .sink { [weak self] newState in
                 guard let self else { return }
                 if let location = newState.location {

Tests/MapboxNavigationCoreTests/Map/Camera/NavigationCameraTests.swift

@@ -244,15 +244,8 @@ class NavigationCameraTests: BaseTestCase {
     }
 
     @MainActor
-    func testViewportDataSourceForActiveGuidance() async {
+    func testViewportDataSourceForActiveGuidance() async throws {
         let navigationViewportDataSource = navigationCamera.viewportDataSource as? MobileViewportDataSource
-
-        let expectation = XCTestExpectation(description: "Camera options expectation.")
-        navigationCamera.cameraStates
-            .sink { _ in
-                expectation.fulfill()
-            }.store(in: &subscriptions)
-
         let location = CLLocation(latitude: 37.112341, longitude: -122.1111678)
         locationPublisher.send(location)
 
@@ -261,7 +254,7 @@ class NavigationCameraTests: BaseTestCase {
         progress.update(using: status)
         routeProgressPublisher.send(progress)
 
-        await fulfillment(of: [expectation], timeout: 1)
+        try await Task.sleep(nanoseconds: NSEC_PER_SEC)
 
         let cameraOptions = navigationViewportDataSource?.currentNavigationCameraOptions
         guard let temporaryPitch = cameraOptions?.followingCamera.pitch else {