使用react-导航版本5的中间选项卡按钮

import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import Icon from 'react-native-vector-icons/FontAwesome';

const Tab = createBottomTabNavigator();

function HomeScreen() {
  return <Text>Home!</Text>;
}

function SettingsScreen() {
  return <Text>Settings!</Text>;
}

function MiddleTabScreen() {
  return <Text>Middle Tab!</Text>;
}

export default function App() {
  return (
    <NavigationContainer>
      <Tab.Navigator
        screenOptions={({ route }) => ({
          tabBarIcon: ({ color, size }) => {
            let iconName;

            if (route.name === 'Home') {
              iconName = 'home';
            } else if (route.name === 'Settings') {
              iconName = 'cog';
            } else if (route.name === 'Middle') {
              iconName = 'plus';
            }

            return <Icon name={iconName} size={size} color={color} />;
          },
        })}
        tabBarOptions={{
          activeTintColor: 'tomato',
          inactiveTintColor: 'gray',
        }}
      >
        <Tab.Screen name="Home" component={HomeScreen} />
        <Tab.Screen name="Middle" component={MiddleTabScreen} options={{ tabBarLabel: '', tabBarIcon: () => null }} />
        <Tab.Screen name="Settings" component={SettingsScreen} />
      </Tab.Navigator>
    </NavigationContainer>
  );
}