更改单个选项卡栏图标的unselectedItemTintColor

import React from 'react';
import { View, Text, StyleSheet } from 'react-native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import { Ionicons } from '@expo/vector-icons';

const Tab = createBottomTabNavigator();

const HomeScreen = () => (
  <View style={styles.container}>
    <Text>Home Screen</Text>
  </View>
);

const ProfileScreen = () => (
  <View style={styles.container}>
    <Text>Profile Screen</Text>
  </View>
);

const App = () => (
  <Tab.Navigator
    screenOptions={({ route }) => ({
      tabBarIcon: ({ focused, color, size }) => {
        let iconName;

        if (route.name === 'Home') {
          iconName = focused ? 'home' : 'home-outline';
        } else if (route.name === 'Profile') {
          iconName = focused ? 'person' : 'person-outline';
        }

        return <Ionicons name={iconName} size={size} color={color} />;
      },
      tabBarActiveTintColor: 'blue',
      tabBarInactiveTintColor: 'gray',
    })}
  >
    <Tab.Screen name="Home" component={HomeScreen} />
    <Tab.Screen name="Profile" component={ProfileScreen} />
  </Tab.Navigator>
);

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

export default App;