如何在反应导航中有条件地隐藏 Tab？

Question

如果用户登录，我想有条件地隐藏我的选项卡之一，

所以我有 5 个选项卡如果用户登录\\注册我从 redux 商店得到一个布尔值，如果这个用户登录我想如何“库选项卡”如果没有登录，我不想与其他人一起显示这个选项卡“库”只需在应用程序中保留 4 个标签

代码

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

let {isLogin} = store.getState().user;


const TabHome = createBottomTabNavigator(
  {
    Home: {
      screen: Home,
      navigationOptions: {
        tabBarLabel: 'Home',
      },
    },
    Browse: {
      screen: Browse,
      navigationOptions: {
        tabBarLabel: 'Browse',
      },
    },
    Search: {
      screen: Search,
      navigationOptions: {
        tabBarLabel: 'Search',
        headerShown: false,
      },
    },
    Radio: {
      screen: Radio,
      navigationOptions: {
        tabBarLabel: 'Radio',
      },
    },
    Library: isLogin ? (
      {
        screen: YourLibrary,
        navigationOptions: {
          tabBarLabel: 'Library',
        },
      }
    ) : (
      <View /> // Or :null => Not work and got the under error msg
    ),
    // Library: {
    //   screen: YourLibrary,
    // },
  },
)

export default createAppContainer(TabHome);

错误：路由“库”的组件必须是 React 组件。 例如：

从 './MyScreen' 导入 MyScreen； ...图书馆：MyScreen，}

您还可以使用导航器：

从 './MyNavigator' 导入 MyNavigator； ...图书馆：MyNavigator，}

Answer 1

在 React Navigation v5 中：

import * as React from 'react';
import { Text, View } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';

function HomeScreen(props) {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Home!</Text>
    </View>
  );
}

function SettingsScreen() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Settings!</Text>
    </View>
  );
}

function AboutScreen() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>About!</Text>
    </View>
  );
}

const Tab = createBottomTabNavigator();

function MyTabs() {
  const [showTab, setShowTab] = React.useState(true);

  // Show the about tab after 5 seconds.
  // Change this to use Redux or however
  // you would like to change which tabs are displayed
  setTimeout(() => {
    setShowTab(false);
    console.log('Hide tab');
  }, 5000);

  return (
    <Tab.Navigator>
      <Tab.Screen
        name="Home"
        component={HomeScreen}
        options={{
          tabBarLabel: 'Home',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="home" color={color} size={size} />
          ),
        }}
      />
      {showTab ? (
        <Tab.Screen
          name="About"
          component={AboutScreen}
          options={{
            tabBarLabel: 'About',
            tabBarIcon: ({ color, size }) => (
              <MaterialCommunityIcons name="book" color={color} size={size} />
            ),
          }}
        />
      ) : null}
      <Tab.Screen
        name="Settings"
        component={SettingsScreen}
        options={{
          tabBarLabel: 'Settings',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="settings" color={color} size={size} />
          ),
        }}
      />
    </Tab.Navigator>
  );
}

export default function App() {
  return (
    <NavigationContainer>
      <MyTabs />
    </NavigationContainer>
  );
}

Expo 中的示例https://snack.expo.io/@jackvial/createbottomtabnavigator-%7C-react-navigation-v5

Answer 2

您知道可以覆盖 Tabbar 组件并为其添加自己的逻辑吗？ 也许这给了你一个想法： https : //stackoverflow.com/a/58520533/1256697

也许通过这种方式，您可以设置条件样式来显示或隐藏 TabBar 的单个项目。

Answer 3

从TabHome删除Library选项卡定义并在导出组件之前添加它：

if(isLogin) {
  TabHome.Library = {
    screen: YourLibrary,
    navigationOptions: {
      tabBarLabel: 'Library',
    }
  }
}

export default createAppContainer(TabHome)