react-navigation 6.x 学习（3）

Tab navigation

移动应用中最常见的导航是基于Tab的导航。这可以是屏幕底部的标签，也可以标题下面的标签（甚至可以代替标题）。

本指南涵盖了createBottomTabNavigator。您也可以使用createMaterialBottomTabNavigator和createMaterialTopTabNavigator来为您的应用程序添加标签。

在继续之前，首先安装@react-navigation/bottom-tabs:

npm install @react-navigation/bottom-tabs
yarn add @react-navigation/bottom-tabs
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基于tab导航的实例

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

function HomeScreen() {
  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>
  );
}

const Tab = createBottomTabNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Tab.Navigator>
        <Tab.Screen name="Home" component={HomeScreen} />
        <Tab.Screen name="Settings" component={SettingsScreen} />
      </Tab.Navigator>
    </NavigationContainer>
  );
}
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自定义外观

这类似于您定制堆栈导航器的方式——有些属性是在初始化选项卡导航器时设置的，而其他属性则可以在每个屏幕的选项(options)中定制。

// You can import Ionicons from @expo/vector-icons/Ionicons if you use Expo or
// react-native-vector-icons/Ionicons otherwise.
import Ionicons from 'react-native-vector-icons/Ionicons';

// (...)

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

            if (route.name === 'Home') {
              iconName = focused
                ? 'ios-information-circle'
                : 'ios-information-circle-outline';
            } else if (route.name === 'Settings') {
              iconName = focused ? 'ios-list-box' : 'ios-list';
            }

            // You can return any component that you like here!
            return <Ionicons name={iconName} size={size} color={color} />;
          },
          tabBarActiveTintColor: 'tomato',
          tabBarInactiveTintColor: 'gray',
        })}
      >
        <Tab.Screen name="Home" component={HomeScreen} />
        <Tab.Screen name="Settings" component={SettingsScreen} />
      </Tab.Navigator>
    </NavigationContainer>
  );
}
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1.tabBarIcon是底部标签导航器中支持的选项。所以我们可以在屏幕(Screen)组件的options属性中使用它，但在这里我们选择把它放在Tab的screenOptions属性中。导航器以便集中配置图标。

2.tabBarIcon是一个提供 focused, color, size参数的函数。
3.tabBarActiveTintColor和tabBarInactiveTintColor，可以在这里更改它们颜色。传递给tabBarIcon的颜色是活动的还是非活动的，这取决于聚焦状态(聚焦是活动的)。size是标签栏所期望的图标大小。

给icons添加徽章

有时我们想在一些图标上添加徽章。你可以使用tabBarBadge选项:

{ tabBarBadge: 3 }} />
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tabs之间跳转

从一个tab跳转到另一个tab,也是使用 navigation.navigate

function HomeScreen({ navigation }) {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Home!</Text>
      <Button
        title="Go to Settings"
        onPress={() => navigation.navigate('Settings')}
      />
    </View>
  );
}

function SettingsScreen({ navigation }) {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Settings!</Text>
      <Button title="Go to Home" onPress={() => navigation.navigate('Home')} />
    </View>
  );
}
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每个tab的堆栈导航器

每个标签中都有独立的导航栈

import * as React from 'react';
import { Button, Text, View } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';

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

function HomeScreen({ navigation }) {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Home screen</Text>
      <Button
        title="Go to Details"
        onPress={() => navigation.navigate('Details')}
      />
    </View>
  );
}

function SettingsScreen({ navigation }) {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Settings screen</Text>
      <Button
        title="Go to Details"
        onPress={() => navigation.navigate('Details')}
      />
    </View>
  );
}

const HomeStack = createNativeStackNavigator();

function HomeStackScreen() {
  return (
    <HomeStack.Navigator>
      <HomeStack.Screen name="Home" component={HomeScreen} />
      <HomeStack.Screen name="Details" component={DetailsScreen} />
    </HomeStack.Navigator>
  );
}

const SettingsStack = createNativeStackNavigator();

function SettingsStackScreen() {
  return (
    <SettingsStack.Navigator>
      <SettingsStack.Screen name="Settings" component={SettingsScreen} />
      <SettingsStack.Screen name="Details" component={DetailsScreen} />
    </SettingsStack.Navigator>
  );
}

const Tab = createBottomTabNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Tab.Navigator>
        <Tab.Screen name="Home" component={HomeStackScreen} />
        <Tab.Screen name="Settings" component={SettingsStackScreen} />
      </Tab.Navigator>
    </NavigationContainer>
  );
}
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Drawer navigation

导航中的常见模式是从左边(有时是右边)使用抽屉在屏幕之间导航。

安装

npm install @react-navigation/drawer
yarn add @react-navigation/drawer
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也需要安装react-native-gesture-handler and react-native-reanimated.

npm install react-native-gesture-handler react-native-reanimated
或
yarn add react-native-gesture-handler react-native-reanimated
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在index.js或App.js中引入文件

import 'react-native-gesture-handler';
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基于drawer的实例

import * as React from 'react';
import { Button, View } from 'react-native';
import { createDrawerNavigator } from '@react-navigation/drawer';
import { NavigationContainer } from '@react-navigation/native';

function HomeScreen({ navigation }) {
  return (
    <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
      <Button
        onPress={() => navigation.navigate('Notifications')}
        title="Go to notifications"
      />
    </View>
  );
}

function NotificationsScreen({ navigation }) {
  return (
    <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
      <Button onPress={() => navigation.goBack()} title="Go back home" />
    </View>
  );
}

const Drawer = createDrawerNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Drawer.Navigator initialRouteName="Home">
        <Drawer.Screen name="Home" component={HomeScreen} />
        <Drawer.Screen name="Notifications" component={NotificationsScreen} />
      </Drawer.Navigator>
    </NavigationContainer>
  );
}
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打开和关闭drawer

navigation.openDrawer();
navigation.closeDrawer();
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切换drawer

navigation.toggleDrawer();
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