React Navigation - 如何在 TabNavigator 中跨不同屏幕传递数据? [英] React Navigation - How to pass data across different screens in TabNavigator?

问题描述

我有一个 TabNavigator，每个选项卡中都有一个 StackNavigator.在 StackNavigator 中，我有屏幕.每个 Tab 中的屏幕不直接相互调用；TabNavigator 处理按下选项卡时的屏幕变化.

I have a TabNavigator, and in each tab is a StackNavigator. Inside the StackNavigator, I have screens. The screens in each Tab do not call each other directly; the TabNavigator handles the screen changes when a tab is pressed.

在第一个选项卡中，如果用户单击按钮，则会创建一些数据.如果用户随后导航到第二个 Tab，我想将此数据传递到第二个 Tab 中的屏幕.

In the first tab, if the user clicks a button, some data is created. If the user then navigates to the second Tab, I would like to pass this data to the screen in the second Tab.

这是代码的演示:

import React from 'react';
import { Button, Text, View } from 'react-native';
import {
  createBottomTabNavigator,
  createStackNavigator,
} from 'react-navigation';


class HomeScreen extends React.Component {
  doIt = () => {
    this.props.navigation.setParams({results: ['one', 'two']});   // <--- set data when user clicks button.
  }

  render() {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        {/* other code from before here */}
        <Button
          title="Set Results"
          onPress={this.doIt}
        />
      </View>
    );
  }
}

class SettingsScreen extends React.Component {
  render() {

    console.log(this.props.navigation);  // <--- console out when user clicks on this tab

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

const HomeStack = createStackNavigator({
  Home: HomeScreen,
});

const SettingsStack = createStackNavigator({
  Settings: SettingsScreen,
});

export default createBottomTabNavigator(
  {
    Home: HomeStack,
    Settings: SettingsStack,
  },
  {
  }
);

this.props.navigation.state.params 永远不会在第二个 Tab 中获取数据 results.它甚至没有密钥，所以如果我尝试访问 this.props.navigation.state.params.results，它将是未定义的.

The this.props.navigation.state.params never gets the data results in the second Tab. There isn't even a key for it, so if I try to access this.props.navigation.state.params.results, it will be undefined.

这令人困惑，因为我认为 props.navigation 是 自动传递到所有屏幕.

This is confusing because I thought props.navigation is passed to all screens automatically.

如何仅使用 react-navigation 通过 TabNavigator 将数据从一个屏幕传递到另一个屏幕?我已经看到说使用 Redux 的答案，但如果我只想在不同的 React 导航器中跨屏幕保持一些状态，我不想导入另一个库.

How can I pass data from one screen to another through the TabNavigator, using just react-navigation? I have seen answers that say to use Redux, but I would not like to import another library if all I want is to keep some state across screens in different react navigators.

推荐答案

在跨不同选项卡传递数据时设置道具不起作用.我什至尝试使用 AsyncStorage，尝试在不同的选项卡中保存和检索它们.

Setting props did not work when passing data across different tabs. I even tried playing with AsyncStorage, trying to save and retrieve them in different tabs.

我最终使用 Redux 来保存我的状态，到目前为止效果很好.

I ended up using Redux to save my states, and that has worked well so far.

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