Fix constants error when there is no bottomTabs loaded (#5706)

lib/ios/Constants.m

 }
 
 + (CGFloat)topBarHeight {
-	return [UIApplication .sharedApplication.delegate.window.rootViewController getTopBarHeight];
+	return [UIApplication.sharedApplication.delegate.window.rootViewController getTopBarHeight];
 }
 
 + (CGFloat)statusBarHeight {
 }
 
 + (CGFloat)bottomTabsHeight {
-	@try {
-		return CGRectGetHeight(((UITabBarController *) UIApplication.sharedApplication.windows[0].rootViewController).tabBar.frame);
-	} @catch (NSException *exception) {
-		return 0;
-	}
+	return [UIApplication.sharedApplication.delegate.window.rootViewController getBottomTabsHeight];
 }
 
 @end

lib/ios/RNNBottomTabsController.m

 	return self.selectedViewController;
 }
 
-- (CGFloat)getTopBarHeight {
-    for(UIViewController * child in [self childViewControllers]) {
-        CGFloat childTopBarHeight = [child getTopBarHeight];
-        if (childTopBarHeight > 0) return childTopBarHeight;
-    }
-    return [super getTopBarHeight];
+- (CGFloat)getBottomTabsHeight {
+    return self.tabBar.frame.size.height;
 }
 
 - (void)setSelectedIndexByComponentID:(NSString *)componentID {

lib/ios/RNNComponentViewController.m

 	return nil;
 }
 
-- (CGFloat)getTopBarHeight {
-    return [[self getCurrentChild] getTopBarHeight];
-}
-
 -(void)updateSearchResultsForSearchController:(UISearchController *)searchController {
 	[self.eventEmitter sendOnSearchBarUpdated:self.layoutInfo.componentId
 										 text:searchController.searchBar.text

lib/ios/RNNLayoutProtocol.h

 
 - (UIViewController<RNNLayoutProtocol> *)getCurrentChild;
 
-- (CGFloat) getTopBarHeight;
+- (CGFloat)getTopBarHeight;
+
+- (CGFloat)getBottomTabsHeight;
 
 - (void)mergeOptions:(RNNNavigationOptions *)options;
 

lib/ios/RNNSideMenuController.m

     return options;
 }
 
-- (CGFloat)getTopBarHeight {
-    for(UIViewController * child in [self childViewControllers]) {
-        CGFloat childTopBarHeight = [child getTopBarHeight];
-        if (childTopBarHeight > 0) return childTopBarHeight;
-    }
-    return [super getTopBarHeight];
-}
-
 @end

lib/ios/UIViewController+LayoutProtocol.m

 }
 
 - (CGFloat)getTopBarHeight {
+    for(UIViewController * child in [self childViewControllers]) {
+        CGFloat childTopBarHeight = [child getTopBarHeight];
+        if (childTopBarHeight > 0) return childTopBarHeight;
+    }
+    
+    return 0;
+}
+
+- (CGFloat)getBottomTabsHeight {
+    for(UIViewController * child in [self childViewControllers]) {
+        CGFloat childBottomTabsHeight = [child getBottomTabsHeight];
+        if (childBottomTabsHeight > 0) return childBottomTabsHeight;
+    }
+    
     return 0;
 }