使用类而不是无状态功能组件 - 反应原生

时间:2017-05-28 09:13:32

标签: react-native react-navigation react-tabs

我是新来的本地人。我使用了功能组件而不是工作正常的类。在这里,我不能使用构造函数,状态,生命周期方法等。所以我想创建一个类而不是函数但没有运气。

功能组件(index.android.js)

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  Button,
  View
} from 'react-native';

import {
  TabNavigator
} from 'react-navigation';

import MyHomeScreen from './MyHomeScreen';
import MyNotificationsScreen from './MyNotificationsScreen';

const TabNavigation = TabNavigator({
  Home: {
    screen: MyHomeScreen,
  },
  Notifications: {
    screen: MyNotificationsScreen,
  },
}, {
  tabBarOptions: {
    activeTintColor: '#e91e63',
  },
});

AppRegistry.registerComponent('TabNavigation', () => TabNavigation);

MyHomeScreen.js

export default class MyHomeScreen extends React.Component {
  static navigationOptions = {
    tabBarLabel: 'Home',
    tabBarIcon: ({ tintColor }) => (
      <Image
        source={require('./chats-icon.png')}
      />
    ),
  };

  render() {
    return (
      <Button
        onPress={() => this.props.navigation.navigate('Notifications')}
        title="Go to notifications"
      />
    );
  }
}

MyNotificationsScreen.js

export default class MyNotificationsScreen extends React.Component {
  static navigationOptions = {
    tabBarLabel: 'Notifications',
    tabBarIcon: ({ tintColor }) => (
      <Image
        source={require('./notif-icon.png')}
      />
    ),
  };

  render() {
    return (
      <Button
        onPress={() => this.props.navigation.goBack()}
        title="Go back home"
      />
    );
  }
}

使用class:我想使用如下类。如何使其像上面名为TabNavigation的功能组件一样工作?

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  Button,
  View
} from 'react-native';

import {
  TabNavigator
} from 'react-navigation';

import MyHomeScreen from './MyHomeScreen';
import MyNotificationsScreen from './MyNotificationsScreen';    

export default class TabNavigation extends Component {

  render() {
    return (
      <View>
      //what to do here
      </View>
    );
  }
}   

1 个答案:

答案 0 :(得分:0)

如果要在顶层渲染TabNavigation,那么执行此操作的方法与第一个示例相同。 /kibana构建一个组件。

您的用例在您的问题中似乎并不清楚,但如果您想要一个顶级的课程,您可以将TabNavigation包装在一个类中:

TabNavigator()