[MAPSME-5045] [ios] Added save/restore route points support.

iphone/Maps/Classes/MapsAppDelegate.mm

@@ -404,6 +404,8 @@ using namespace osm_auth_ios;
   }
   [self enableTTSForTheFirstTime];
 
+  [MWMRouter restoreRouteIfNeeded];
+
   return returnValue;
 }
 
@@ -524,6 +526,7 @@ using namespace osm_auth_ios;
 - (void)applicationWillTerminate:(UIApplication *)application
 {
   [self.mapViewController onTerminate];
+  [MWMRouter saveRouteIfNeeded];
 
 #ifdef OMIM_PRODUCTION
   auto err = [[NSError alloc] initWithDomain:kMapsmeErrorDomain

iphone/Maps/Core/Routing/MWMRouter.h

@@ -47,6 +47,9 @@ typedef void (^MWMImageHeightBlock)(UIImage *, NSString *);
 + (BOOL)hasRouteAltitude;
 + (void)routeAltitudeImageForSize:(CGSize)size completion:(MWMImageHeightBlock)block;
 
++ (void)saveRouteIfNeeded;
++ (void)restoreRouteIfNeeded;
+
 @end
 
 @interface MWMRouter (RouteManager)

iphone/Maps/Core/Routing/MWMRouter.mm

@@ -645,4 +645,30 @@ void logPointEvent(MWMRoutePoint * point, NSString * eventType)
   }
 }
 
+#pragma mark - Save / Load route points
+
++ (void)saveRouteIfNeeded
+{
+  if ([self isRoutingActive])
+    GetFramework().GetRoutingManager().SaveRoutePoints();
+}
+
++ (void)restoreRouteIfNeeded
+{
+  if ([MapsAppDelegate theApp].isDrapeEngineCreated)
+  {
+    auto & rm = GetFramework().GetRoutingManager();
+    if ([self isRoutingActive] || !rm.HasSavedRoutePoints())
+      return;
+    rm.LoadRoutePoints();
+    [self rebuildWithBestRouter:YES];
+  }
+  else
+  {
+    dispatch_async(dispatch_get_main_queue(), ^{
+      [self restoreRouteIfNeeded];
+    });
+  }
+}
+
 @end