[MAPSME-5305] [ios] Fixed voice change support.

iphone/Maps/Classes/CustomViews/NavigationDashboard/MWMNavigationDashboardManager.mm

@@ -139,8 +139,8 @@ using Observers = NSHashTable<Observer>;
   self.routePreview = nil;
   self.navigationInfoView.state = MWMNavigationInfoViewStateHidden;
   self.navigationInfoView = nil;
-  self.navigationControlView.isVisible = NO;
-  self.navigationControlView = nil;
+  _navigationControlView.isVisible = NO;
+  _navigationControlView = nil;
   [self.statusBox stateHidden];
   self.statusBox = nil;
 }

iphone/Maps/Classes/MapsAppDelegate.mm

@@ -1,6 +1,7 @@
 #import "MapsAppDelegate.h"
 #import <CoreSpotlight/CoreSpotlight.h>
 #import <FBSDKCoreKit/FBSDKCoreKit.h>
+#import "3party/Alohalytics/src/alohalytics_objc.h"
 #import "EAGLView.h"
 #import "LocalNotificationManager.h"
 #import "MWMAuthorizationCommon.h"
@@ -13,10 +14,10 @@
 #import "MWMRoutePoint+CPP.h"
 #import "MWMRouter.h"
 #import "MWMSearch+CoreSpotlight.h"
+#import "MWMTextToSpeech.h"
 #import "MapViewController.h"
 #import "Statistics.h"
 #import "SwiftBridge.h"
-#import "3party/Alohalytics/src/alohalytics_objc.h"
 
 #include "Framework.h"
 
@@ -606,6 +607,7 @@ using namespace osm_auth_ios;
   [MWMLocationManager applicationDidBecomeActive];
   [MWMSearch addCategoriesToSpotlight];
   [MWMKeyboard applicationDidBecomeActive];
+  [MWMTextToSpeech applicationDidBecomeActive];
   LOG(LINFO, ("applicationDidBecomeActive - end"));
 }
 

iphone/Maps/Core/TextToSpeech/MWMTextToSpeech.h

@@ -10,6 +10,8 @@
 + (void)addObserver:(id<MWMTextToSpeechObserver>)observer;
 + (void)removeObserver:(id<MWMTextToSpeechObserver>)observer;
 
++ (void)applicationDidBecomeActive;
+
 @property(nonatomic) BOOL active;
 - (void)setNotificationsLocale:(NSString *)locale;
 - (void)playTurnNotifications;

iphone/Maps/Core/TextToSpeech/MWMTextToSpeech.mm

@@ -72,6 +72,12 @@ using Observers = NSHashTable<Observer>;
   return tts;
 }
 
++ (void)applicationDidBecomeActive
+{
+  [MWMTextToSpeech tts].speechSynthesizer = nil;
+  [MWMTextToSpeech tts].speechVoice = nil;
+}
+
 - (instancetype)initTTS
 {
   self = [super init];
@@ -154,7 +160,7 @@ using Observers = NSHashTable<Observer>;
   if (![[self class] isTTSEnabled] || self.active == active)
     return;
   if (active && ![self isValid])
-    [self createSynthesizer];
+    [self createVoice:[MWMTextToSpeech savedLanguage]];
   [self setAudioSessionActive:active];
   [MWMRouter enableTurnNotifications:active];
   dispatch_async(dispatch_get_main_queue(), ^{
@@ -168,21 +174,14 @@ using Observers = NSHashTable<Observer>;
   return [[NSUserDefaults standardUserDefaults] stringForKey:kUserDefaultsTTSLanguageBcp47];
 }
 
-- (void)createSynthesizer
-{
-  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-    self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
-    self.speechSynthesizer.delegate = self;
-    [self createVoice:[[self class] savedLanguage]];
-  });
-  // TODO(vbykoianko) Use [NSLocale preferredLanguages] instead of [AVSpeechSynthesisVoice
-  // currentLanguageCode].
-  // [AVSpeechSynthesisVoice currentLanguageCode] is used now because of we need a language code in
-  // BCP-47.
-}
-
 - (void)createVoice:(NSString *)locale
 {
+  if (!self.speechSynthesizer)
+  {
+    self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
+    self.speechSynthesizer.delegate = self;
+  }
+
   NSMutableArray<NSString *> * candidateLocales = [@[ kDefaultLanguage, @"en-GB" ] mutableCopy];
 
   if (locale)
@@ -238,7 +237,13 @@ using Observers = NSHashTable<Observer>;
 
 - (void)playTurnNotifications
 {
-  if (![MWMRouter isOnRoute] || ![self isValid])
+  if (![MWMRouter isOnRoute])
+    return;
+
+  if (self.active && ![self isValid])
+    [self createVoice:[MWMTextToSpeech savedLanguage]];
+
+  if (!self.active || ![self isValid])
     return;
 
   NSArray<NSString *> * turnNotifications = [MWMRouter turnNotifications];