如何使appbar的标题居中

AppBar(
  title: Text('居中的标题'),
)

import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';

const Stack = createStackNavigator();

function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen
          name="Home"
          component={HomeScreen}
          options={{ headerTitleAlign: 'center' }} // 设置标题居中
        />
      </Stack.Navigator>
    </NavigationContainer>
  );
}

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

TextView titleTextView = new TextView(this);
titleTextView.setText("居中的标题");
titleTextView.setGravity(Gravity.CENTER);
toolbar.addView(titleTextView);

val toolbar = findViewById<Toolbar>(R.id.toolbar)
setSupportActionBar(toolbar)

val titleTextView = TextView(this)
titleTextView.text = "居中的标题"
titleTextView.gravity = Gravity.CENTER
toolbar.addView(titleTextView)

let navController = UINavigationController(rootViewController: ViewController())

let viewController = ViewController()
viewController.navigationItem.titleView = UILabel()
viewController.navigationItem.titleView?.text = "居中的标题"
viewController.navigationItem.titleView?.textAlignment = .center

navController.pushViewController(viewController, animated: true)