如何使用 Tab Navigator NOT 堆栈导航器将参数传递给路由

Question

我使用反应导航库，特别是 createBottomTabNavigator

https://reactnavigation.org/docs/en/params.html 上的文档解释了如何使用堆栈导航器在路由之间传递参数，但我使用选项卡导航器，我找不到任何跳出来解释如何做的东西在选项卡导航设置中

我在 App.js 中的标签导航器是

const BottomTabMenu = createBottomTabNavigator (
  {
    WatchList: { screen: WatchListScreen },
    Alerts: { screen: AlertsScreen },
    Analytics: { screen: AnalyticsScreen },
    Settings: { screen: SettingsScreen },
  },
  {
    initialRouteName: 'WatchList',
    defaultNavigationOptions: ({ navigation }) => ({
      tabBarIcon: ({ focused, horizontal, tintColor }) => {
        const { routeName } = navigation.state;
        let IconComponent = Ionicons;
        let iconName;
        if (routeName === 'WatchList') { iconName = 'md-list'; }  
        if (routeName === 'Alerts') { iconName = 'md-alert'; }  
        if (routeName === 'Analytics') { iconName = 'md-analytics'; }  
        if (routeName === 'Settings') { iconName = 'md-settings'; }

        return <IconComponent name={iconName} size={25} color={tintColor} />;
      },
    }),
    tabBarOptions: {
      activeTintColor: 'tomato',
      inactiveTintColor: 'gray',
    },
  }
);
const AppContainer = createAppContainer(BottomTabMenu);

watchList 路由包含一个名为符号的 jsonfile，我想将其传递给 alertsScreen.js 中的警报路由

export default class WatchListScreen extends React.Component {

    constructor(props) {
        super(props)
        this.state = {
            symbols: [],
        }
    }  
LOTS OF OTHER STUFF

警报屏幕.JS

export default class AlertsScreen extends React.Component {

    render() {
        //according to the docs, this is how to receive in the props
        const { navigation } = this.props;
        const jsonWatchList = navigation.getParam('jsonWatchList', '[]');

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

根据文档，我需要传递数据的行将是这样的

this.props.navigation.navigate('Alerts', {
              jsonWatchList: [lots of data here],
            });

唯一的问题是我不知道它应该去哪里。

Answer 1

它在您的链接（ https://reactnavigation.org/docs/en/params.html ）中有详细记录。它解释了如何在路由之间传递参数。使用 astackNavigator或 a并不重要createBottomTabNavigator

像您想要的那样传递您的参数：

this.props.navigation.navigate('jsonWatchList', { jsonWatchList: [lots of data here], });

在你的另一个屏幕上，让它们像这样：

const data = this.props.navigation.getParam('jsonWatchList');