Let speak instructions without route progress.

MapboxNavigation/RouteVoiceController.swift

@@ -192,13 +192,9 @@ open class RouteVoiceController: NSObject, AVSpeechSynthesizerDelegate {
 
      - parameter instruction: The instruction to read aloud.
      - parameter locale: The `Locale` used to create the voice read aloud the given instruction. If `nil` the `Locale.preferredLocalLanguageCountryCode` is used for creating the voice.
+     - parameter ignoreProgress: A `Bool` that indicates if the routeProgress is added to the instruction.
      */
-    open func speak(_ instruction: SpokenInstruction, with locale: Locale?) {
-        guard let routeProgress else {
-            assertionFailure("routeProgress should not be nil.")
-            return
-        }
-
+    open func speak(_ instruction: SpokenInstruction, with locale: Locale?, ignoreProgress: Bool = false) {
         if speechSynth.isSpeaking, let lastSpokenInstruction = lastSpokenInstruction {
             voiceControllerDelegate?.voiceController?(self, didInterrupt: lastSpokenInstruction, with: instruction)
         }
@@ -209,29 +205,29 @@ open class RouteVoiceController: NSObject, AVSpeechSynthesizerDelegate {
             voiceControllerDelegate?.voiceController?(self, spokenInstructionsDidFailWith: error)
         }
 
-        var utterance: AVSpeechUtterance?
+        var utterance = AVSpeechUtterance(string: instruction.text)
         if locale?.identifier == "en-US" {
             // Alex can’t handle attributed text.
-            utterance = AVSpeechUtterance(string: instruction.text)
-            utterance!.voice = AVSpeechSynthesisVoice(identifier: AVSpeechSynthesisVoiceIdentifierAlex)
+            utterance.voice = AVSpeechSynthesisVoice(identifier: AVSpeechSynthesisVoiceIdentifierAlex)
         }
 
-        let modifiedInstruction = voiceControllerDelegate?.voiceController?(self, willSpeak: instruction, routeProgress: routeProgress) ?? instruction
-
-        if #available(iOS 10.0, *), utterance?.voice == nil {
+        if 
+            #available(iOS 10.0, *),
+            !ignoreProgress,
+            utterance.voice == nil, 
+            let routeProgress
+        {
+            let modifiedInstruction = voiceControllerDelegate?.voiceController?(self, willSpeak: instruction, routeProgress: routeProgress) ?? instruction
+
             utterance = AVSpeechUtterance(attributedString: modifiedInstruction.attributedText(for: routeProgress.currentLegProgress))
-        } else {
-            utterance = AVSpeechUtterance(string: modifiedInstruction.text)
         }
 
         // Only localized languages will have a proper fallback voice
-        if utterance?.voice == nil {
-            utterance?.voice = AVSpeechSynthesisVoice(language: locale?.identifier ?? Locale.preferredLocalLanguageCountryCode)
+        if utterance.voice == nil {
+            utterance.voice = AVSpeechSynthesisVoice(language: locale?.identifier ?? Locale.preferredLocalLanguageCountryCode)
         }
 
-        if let utterance = utterance {
-            speechSynth.speak(utterance)
-        }
+        speechSynth.speak(utterance)
     }
 }
 

MapboxNavigationTests/NavigationViewControllerTests.swift

@@ -286,7 +286,7 @@ class TestableDayStyle: DayStyle {
 
 
 class FakeVoiceController: RouteVoiceController {
-    override func speak(_ instruction: SpokenInstruction, with locale: Locale?) {
+    override func speak(_ instruction: SpokenInstruction, with locale: Locale?, ignoreProgress: Bool = false) {
         //no-op
     }