chore(iOS): refactor back button logic

ios/RNSScreenStackHeaderConfig.mm

@@ -533,20 +533,21 @@ + (void)updateViewController:(UIViewController *)vc
 #if !TARGET_OS_TV
   const auto isBackTitleBlank = [NSString rnscreens_isBlankOrNull:config.backTitle] == YES;
   NSString *resolvedBackTitle = isBackTitleBlank ? prevItem.title : config.backTitle;
-  RNSUIBarButtonItem *backBarButtonItem = [[RNSUIBarButtonItem alloc] initWithTitle:resolvedBackTitle
-                                                                              style:UIBarButtonItemStylePlain
-                                                                             target:nil
-                                                                             action:nil];
-  [backBarButtonItem setMenuHidden:config.disableBackButtonMenu];
-
-  auto shouldUseCustomBackBarButtonItem = config.disableBackButtonMenu;
+  prevItem.backButtonTitle = resolvedBackTitle;
 
   // This has any effect only in case the `backBarButtonItem` is not set.
   // We apply it before we configure the back item, because it might get overriden.
   prevItem.backButtonDisplayMode = config.backButtonDisplayMode;
   prevItem.backButtonTitle = resolvedBackTitle;
 
   if (config.isBackTitleVisible) {
+    auto shouldUseCustomBackBarButtonItem = config.disableBackButtonMenu;
+    RNSUIBarButtonItem *backBarButtonItem = [[RNSUIBarButtonItem alloc] initWithTitle:resolvedBackTitle
+                                                                                style:UIBarButtonItemStylePlain
+                                                                               target:nil
+                                                                               action:nil];
+    [backBarButtonItem setMenuHidden:config.disableBackButtonMenu];
+
     if ((config.backTitleFontFamily &&
          // While being used by react-navigation, the `backTitleFontFamily` will
          // be set to "System" by default - which is the system default font.
@@ -570,19 +571,12 @@ + (void)updateViewController:(UIViewController *)vc
       }
       [self setTitleAttibutes:attrs forButton:backBarButtonItem];
     }
+
+    if (shouldUseCustomBackBarButtonItem) {
+      prevItem.backBarButtonItem = backBarButtonItem;
+    }
   } else {
-    // back button title should be not visible next to back button,
-    // but it should still appear in back menu
     prevItem.backButtonDisplayMode = UINavigationItemBackButtonDisplayModeMinimal;
-    shouldUseCustomBackBarButtonItem = NO;
-  }
-
-  // Prevent unnecessary assignment of backBarButtonItem if it is not customized,
-  // as assigning one will override the native behavior of automatically shortening
-  // the title to "Back" or hide the back title if there's not enough space.
-  // See: https://github.com/software-mansion/react-native-screens/issues/1589
-  if (shouldUseCustomBackBarButtonItem) {
-    prevItem.backBarButtonItem = backBarButtonItem;
   }
 
   if (@available(iOS 11.0, *)) {