react-native-vector-icons在tab中的使用代码示例

...import Ionicons from 'react-native-vector-icons/Ionicons';...const RootTabs = TabNavigator({  Home: {    screen: HomeScreen,    navigationOptions: {      tabBarLabel: 'Home',      tabBarIcon: ({ tintColor, focused }) => (        <Ionicons          name={focused ? 'ios-home' : 'ios-home-outline'}          size={26}          style={{ color: tintColor }}        />      ),    },  },  Profile: {    screen: ProfileScreen,    navigationOptions: {      tabBarLabel: 'Profile',      tabBarIcon: ({ tintColor, focused }) => (        <Ionicons          name={focused ? 'ios-person' : 'ios-person-outline'}          size={26}          style={{ color: tintColor }}        />      ),    },  },});export default RootTabs;