如何在用户注销时重置TabNavigator(从其他屏幕)

Question

这是我的项目文件层次结构

RootTabNavigator
    | AuthStackNavigator // I want to go back to this navigator
          | AuthoScreen
    | Welcome Screen
    | MainTabNavigator // I want to reset MainTabNavigator 
          | FeedStacknavigator
                   | Screen A
          | OtherStackNavigatorOne
                   | Screen E
          | OtherStackNavigatorTwo
                   | Screen D
          | MenuStackNavigator 
                   | Menuo <-I'm here and want to reset to 'MainTabNavigator' 
                             and go BACK to 'AuthScreen'
           | Screen B
                   | Screen C

问题

用户在MenuStackNavigator和MainTabNavigator下的Menuo屏幕上.

如果用户没有令牌(当用户注销时),则用户返回到Auth Screen.

但同时我想重置MainTabNavigator.您可以卸载,执行NavigationActions.init()或其他任何操作.我更喜欢NavigationActions.init()

我只是想将MainTabNavigator设置为第一次.

码

如果没有令牌,我会回到Auth Screen(这是有效的)

This code if the part of Menuo Screen

componentWillReceiveProps(nextProps) {
    if ( nextProps.token == undefined || _.isNil(nextProps.token) ) {
      const backAction = NavigationActions.back({
        key: null
      })
      nextProps.navigation.dispatch(backAction);
      ...

(问题)我们如何重置MainTabNavigator,包括子StackNavigators？

MainTabNavigator.js

export default TabNavigator(
    {
        Feed: {
          screen: FeedStacknavigator,
        },
        OtherOne: {
          screen: OtherStackNavigatorOne,
        }
        ...
    }, {
        navigationOptions: ({navigation}) => ){
            header: null,
        tabBarIcon: ({focused}) => ...
        ...
    }

可能解决方案

我可以将MainTabNavigator从函数更改为类,并在那里处理重置TabNavigator.(我不确定).

这一次,我需要一个具体的工作实例.我一直在阅读文档并申请我的应用程序,但我无法解决这个问题.

如果有任何不清楚的地方,请告诉我.

UPDATE

const RootTabNavigator = TabNavigator ({
    Auth: {
      screen: AuthStackNavigator,
    },
    Welcome: {
      screen: WelcomeScreen,
    },
    Main: {
      screen: MainTabNavigator,
    },
  }, {
    navigationOptions: () => ({
     ...
  }
);

export default class RootNavigator extends React.Component {
  componentDidMount() {
    this._notificationSubscription = this._registerForPushNotifications();
  }

Answer 1

这在大多数情况下应该有效：

componentWillReceiveProps(nextProps) {
    if ( nextProps.token == undefined || _.isNil(nextProps.token) ) {

        let action = NavigationActions.reset({
            index: 0,
            key: null,
            actions: [
                NavigationActions.navigate({routeName: 'Auth'})
            ]
        });

        nextProps.navigation.dispatch(action);
    }
    ...
}

或者尝试通过自定义操作增强您的导航器：

const changeAppNavigator = Navigator => {
   const router = Navigator.router;

   const defaultGetStateForAction = router.getStateForAction;

   router.getStateForAction = (action, state) => {
       if (state && action.type === "RESET_TO_AUTH") {
          let payLoad = {
              index: 0,
              key: null,
              actions: [NavigationActions.navigate({routeName: "AuthStackNavigator"})]
          };

          return defaultGetStateForAction(NavigationActions.reset(payLoad), state);
          // or this might work for you, not sure:
          // return defaultGetStateForAction(NavigationActions.init(), state)
       }
       return defaultGetStateForAction(action, state);
  };

  return Navigator;
};

const screens = { ... }

RootTabNavigator = changeAppNavigator(TabNavigator(screens, {
  initialRouteName: ...,
  ...
}));

然后在你Menuo Screen做的事情中：

componentWillReceiveProps(nextProps) {
    if ( nextProps.token == undefined || _.isNil(nextProps.token) ) {

        nextProps.navigation.dispatch({type: "RESET_TO_AUTH"});
    ...