【React Navigation】七、createTabNavigator-选项卡导航器

「 REACT NAVIGATION 」 August 29, 2018

【React Navigation】七、createTabNavigator-选项卡导航器

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移动应用程序中最常见的导航风格可能是基于标签选项卡。这些选项卡可能放置在屏幕底部或标题下方。

本指南介绍createBottomTabNavigator的使用，另外，你还可以使用createMaterialBottomTabNavigator和createMaterialTopTabNavigator为应用程序添加选项卡。

选项卡导航条的小例子

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import React from 'react';
import { Text, View } from 'react-native';
// 引用createBottomTabNavigator模块
import { createBottomTabNavigator } from 'react-navigation';

class HomeScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Home!</Text>
      </View>
    );
  }
}

class SettingsScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Settings!</Text>
      </View>
    );
  }
}

export default createBottomTabNavigator({
  Home: HomeScreen,
  Settings: SettingsScreen,
});

自定义外观

这有点类似于自定义堆栈导航器的方式 - 在初始化选项卡导航器时可以设置一些属性，可以通过navigationOptions中给每个屏幕自定义其他的一些属性。

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

export default createBottomTabNavigator(
  {
    Home: HomeScreen,
    Settings: SettingsScreen,
  },
  {
    navigationOptions: ({ navigation }) => ({
      tabBarIcon: ({ focused, tintColor }) => {
        const { routeName } = navigation.state;
        let iconName;
        if (routeName === 'Home') {
          iconName = `ios-information-circle${focused ? '' : '-outline'}`;
        } else if (routeName === 'Settings') {
          iconName = `ios-options${focused ? '' : '-outline'}`;
        }

        // You can return any component that you like here! We usually use an
        // icon component from react-native-vector-icons
        return <Ionicons name={iconName} size={25} color={tintColor} />;
      },
    }),
    tabBarOptions: {
      activeTintColor: 'tomato',
      inactiveTintColor: 'gray',
    },
  }
);

选项卡间切换

我们可以通过api：this.props.navigation.navigate来进行选项卡间的切换

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import React from 'react';
import { Button, Text, View } from 'react-native';
import { Ionicons } from '@expo/vector-icons'; // Version can be specified in package.json
import { TabNavigator, TabBarBottom } from 'react-navigation'; // Version can be specified in package.json

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

class SettingsScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Settings!</Text>
        <Button
          title="Go to Home"
          onPress={() => this.props.navigation.navigate('Home')}
        />
      </View>
    );
  }
}

export default TabNavigator(
  {
    Home: { screen: HomeScreen },
    Settings: { screen: SettingsScreen },
  },
  {
    navigationOptions: ({ navigation }) => ({
      tabBarIcon: ({ focused, tintColor }) => {
        const { routeName } = navigation.state;
        let iconName;
        if (routeName === 'Home') {
          iconName = `ios-information-circle${focused ? '' : '-outline'}`;
        } else if (routeName === 'Settings') {
          iconName = `ios-options${focused ? '' : '-outline'}`;
        }

        // You can return any component that you like here! We usually use an
        // icon component from react-native-vector-icons
        return <Ionicons name={iconName} size={25} color={tintColor} />;
      },
    }),
    tabBarComponent: TabBarBottom,
    tabBarPosition: 'bottom',
    tabBarOptions: {
      activeTintColor: 'tomato',
      inactiveTintColor: 'gray',
    },
    animationEnabled: false,
    swipeEnabled: false,
  }
);

选项卡的导航器

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import React from 'react';
import { Button, Text, View } from 'react-native';
import { Ionicons } from '@expo/vector-icons'; // Version can be specified in package.json
import { StackNavigator, TabNavigator, TabBarBottom } from 'react-navigation'; // Version can be specified in package.json

class HomeScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Home!</Text>
        <Button
          title="Go to Settings"
          onPress={() => this.props.navigation.navigate('Settings')}
        />
        <Button
          title="Go to Details"
          onPress={() => this.props.navigation.navigate('Details')}
        />
      </View>
    );
  }
}

class SettingsScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Settings!</Text>
        <Button
          title="Go to Home"
          onPress={() => this.props.navigation.navigate('Home')}
        />
        <Button
          title="Go to Details"
          onPress={() => this.props.navigation.navigate('Details')}
        />
      </View>
    );
  }
}

class DetailsScreen extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <Text>Details!</Text>
      </View>
    );
  }
}

const HomeStack = StackNavigator({
  Home: { screen: HomeScreen },
  Details: { screen: DetailsScreen },
});

const SettingsStack = StackNavigator({
  Settings: { screen: SettingsScreen },
  Details: { screen: DetailsScreen },
});

export default TabNavigator(
  {
    Home: { screen: HomeStack },
    Settings: { screen: SettingsStack },
  },
  {
    navigationOptions: ({ navigation }) => ({
      tabBarIcon: ({ focused, tintColor }) => {
        const { routeName } = navigation.state;
        let iconName;
        if (routeName === 'Home') {
          iconName = `ios-information-circle${focused ? '' : '-outline'}`;
        } else if (routeName === 'Settings') {
          iconName = `ios-options${focused ? '' : '-outline'}`;
        }

        // You can return any component that you like here! We usually use an
        // icon component from react-native-vector-icons
        return <Ionicons name={iconName} size={25} color={tintColor} />;
      },
    }),
    tabBarComponent: TabBarBottom,
    tabBarPosition: 'bottom',
    tabBarOptions: {
      activeTintColor: 'tomato',
      inactiveTintColor: 'gray',
    },
    animationEnabled: false,
    swipeEnabled: false,
  }
);

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