如何在React Native中将底部栏选项卡视为按钮？

import { createBottomTabNavigator } from 'react-navigation-tabs';

const TabNavigator = createBottomTabNavigator(
  {
    Home: {
      screen: HomeScreen,
      navigationOptions: {
        tabBarLabel: 'Home',
        tabBarIcon: ({ tintColor }) => (
          <Icon name="home" color={tintColor} size={24} />
        ),
      },
    },
    Profile: {
      screen: ProfileScreen,
      navigationOptions: {
        tabBarLabel: 'Profile',
        tabBarIcon: ({ tintColor }) => (
          <Icon name="person" color={tintColor} size={24} />
        ),
      },
    },
    Settings: {
      screen: SettingsScreen,
      navigationOptions: {
        tabBarLabel: 'Settings',
        tabBarIcon: ({ tintColor }) => (
          <Icon name="settings" color={tintColor} size={24} />
        ),
      },
    },
  },
  {
    tabBarOptions: {
      activeTintColor: 'blue',
      inactiveTintColor: 'gray',
    },
  }
);

export default createAppContainer(TabNavigator);