withNavigation仅可用于导航器的视图层次结构 [英] withNavigation can only be used on a view hierarchy of a navigator

问题描述

我遇到了错误:

不变违反:withNavigation只能在视图上使用 导航器的层次结构.包装的组件无法获取 从道具或上下文访问导航

Invariant Violation: withNavigation can only be used on a view hierarchy of a navigator. The wrapped component is unable to get access to navigation from props or context

我不知道为什么，因为我在应用程序的其他组件中使用了withNavigation，并且可以正常工作.我看不到导致错误的组件的差异.

I don't know why, because I'm using withNavigation in other components in my app and it works. I don't see a difference in the components that it works on to the one that causes the error.

代码:

组件:

const mapStateToProps = (state: State): Object => ({
  alertModal: state.formControls.alertModal
})

const mapDispatchToProps = (dispatch: Dispatch<*>): Object => {
  return bindActionCreators(
    {
      updateAlertModalHeight: updateAlertModalHeight,
      updateAlertModalIsOpen: updateAlertModalIsOpen,
      updateHasYesNo: updateAlertModalHasYesNo
    },
    dispatch
  )
}

class AlertModalView extends Component<AlertModalProps, State> {
  render(): Node {
    return (
      <View style={alertModalStyle.container}>
        <PresentationalModal
          style={presentationalModalStyle}
          isOpen={this.props.alertModal.isOpen}
          title={this.props.alertModal.title}
          navigation={this.props.navigation}
          updateHasYesNo={this.props.updateHasYesNo}
          message={this.props.alertModal.message}
          updateAlertModalHeight={this.props.updateAlertModalHeight}
          viewHeight={this.props.alertModal.viewHeight}
          hasYesNo={this.props.alertModal.hasYesNo}
          yesClicked={this.props.alertModal.yesClicked}
          updateAlertModalIsOpen={this.props.updateAlertModalIsOpen}
        />
      </View>
    )
  }
}

// $FlowFixMe
const AlertModalViewComponent = connect(
  mapStateToProps,
  mapDispatchToProps
)(AlertModalView)

export default withNavigation(AlertModalViewComponent)

stackNavigator:

the stackNavigator:

import React from 'react'
import { View, SafeAreaView } from 'react-native'
import Icon from 'react-native-vector-icons/EvilIcons'
import Add from '../product/add/view'
import Login from '../user/login/view'
import Search from '../product/search/query/view'
import { Image } from 'react-native'
import { StackNavigator, DrawerNavigator, DrawerItems } from 'react-navigation'

const AddMenuIcon = ({ navigate }) => (
  <View>
    <Icon
      name="plus"
      size={30}
      color="#FFF"
      onPress={() => navigate('DrawerOpen')}
    />
  </View>
)

const SearchMenuIcon = ({ navigate }) => (
  <Icon
    name="search"
    size={30}
    color="#FFF"
    onPress={() => navigate('DrawerOpen')}
  />
)

const Stack = {
  Login: {
    screen: Login
  },
  Search: {
    screen: Search
  },
  Add: {
    screen: Add
  }
}


const DrawerRoutes = {
  Login: {
    name: 'Login',
    screen: Login
  },
  'Search Vegan': {
    name: 'Search',
    screen: StackNavigator(Stack.Search, {
      headerMode: 'none'
    }),
    navigationOptions: ({ navigation }) => ({
      drawerIcon: SearchMenuIcon(navigation)
    })
  },
  'Add vegan': {
    name: 'Add',
    screen: StackNavigator(Stack.Add, {
      headerMode: 'none'
    }),
    navigationOptions: ({ navigation }) => ({
      drawerIcon: AddMenuIcon(navigation)
    })
  }
}

const CustomDrawerContentComponent = props => (
  <SafeAreaView style={{ flex: 1, backgroundColor: '#3f3f3f', color: 'white' }}>
    <View>
      <Image
        style={{
          marginLeft: 20,
          marginBottom: 0,
          marginTop: 0,
          width: 100,
          height: 100,
          resizeMode: 'contain'
        }}
        square
        source={require('../../images/logo_v_white.png')}
      />
    </View>
    <DrawerItems {...props} />
  </SafeAreaView>
)

const Menu = StackNavigator(
    {
      Drawer: {
        name: 'Drawer',
        screen: DrawerNavigator(DrawerRoutes, {
          initialRouteName: 'Login',
          drawerPosition: 'left',
          contentComponent: CustomDrawerContentComponent,
          contentOptions: {
            activeTintColor: '#27a562',
            inactiveTintColor: 'white',
            activeBackgroundColor: '#3a3a3a'
          }
        })
      }
    },
    {
      headerMode: 'none',
      initialRouteName: 'Drawer'
    }
  )


export default Menu

在这里，我在应用程序组件中渲染StackNavigator，它是Menu:

Here I render the StackNavigator which is Menu in my app component:

import React, { Component } from 'react'
import Menu from './menu/view'
import Props from 'prop-types'
import { Container } from 'native-base'
import { updateAlertModalIsOpen } from './formControls/alertModal/action'
import AlertModalComponent from './formControls/alertModal/view'
import UserLoginModal from './user/login/loginModal/view'

class Vepo extends Component {
  componentDidMount() {
    const { store } = this.context
    this.unsubscribe = store.subscribe(() => {})
    store.dispatch(this.props.fetchUserGeoCoords())
    store.dispatch(this.props.fetchSearchQueryPageCategories())
    store.dispatch(this.props.fetchCategories())
  }

  componentWillUnmount() {
    this.unsubscribe()
  }

  render(): Object {
    return (
      <Container>
        <Menu store={this.context} />
        <AlertModalComponent
          yesClicked={() => {
            updateAlertModalIsOpen(false)
          }}
        />

        <UserLoginModal />
      </Container>
    )
  }
}
Vepo.contextTypes = {
  store: Props.object
}

export default Vepo

和我的根组件:

export const store = createStore(
  rootReducer,
  vepo,
  composeWithDevTools(applyMiddleware(createEpicMiddleware(rootEpic)))
)

import NavigationService from './navigationService'

export const App = () => (
  <Provider store={store}>
      <Vepo
        fetchUserGeoCoords={fetchUserGeoCoords}
        fetchSearchQueryPageCategories={fetchSearchQueryPageCategories}
        fetchCategories={fetchCategories}
      />
  </Provider>
)
AppRegistry.registerComponent('vepo', () => App)

我已将Vepo组件更改为此，以实现vahissan的答案:

I have changed my Vepo component to this to implement the answer by vahissan:

import React, { Component } from 'react'
import Menu from './menu/view'
import Props from 'prop-types'
import { Container } from 'native-base'
import { updateAlertModalIsOpen } from './formControls/alertModal/action'
import AlertModalComponent from './formControls/alertModal/view'
import UserLoginModal from './user/login/loginModal/view'

import NavigationService from './navigationService'

class Vepo extends Component {
  componentDidMount() {
    const { store } = this.context
    this.unsubscribe = store.subscribe(() => {})
    store.dispatch(this.props.fetchUserGeoCoords())
    store.dispatch(this.props.fetchSearchQueryPageCategories())
    store.dispatch(this.props.fetchCategories())
  }

  componentWillUnmount() {
    this.unsubscribe()
  }

  render(): Object {
    return (
      <Container>
        <Menu
          store={this.context}
          ref={navigatorRef => {
            NavigationService.setTopLevelNavigator(navigatorRef)
          }}>
          <AlertModalComponent
            yesClicked={() => {
              updateAlertModalIsOpen(false)
            }}
          />
        </Menu>
        <UserLoginModal />
      </Container>
    )
  }
}
Vepo.contextTypes = {
  store: Props.object
}

export default Vepo

没有错误，但是alertModal不再显示

No errors, but the alertModal no longer displays

推荐答案

在react-navigation中，主StackNavigator创建一个上下文提供程序，并且navigation prop将在组件树中位于其级别以下的任何组件可用.他们使用上下文使用者.

In react-navigation, the main StackNavigator creates a context provider and the navigation prop will be made available to any component below its level in the component tree if they use the context consumer.

使用上下文使用者访问navigation道具的两种方法是将组件添加到StackNavigator，或使用withNavigation函数.但是，由于React的上下文API的工作原理，任何使用withNavigation函数的组件都必须在组件树中的StackNavigator下方.

Two ways to access the navigation prop using context consumer is to either add the component to the StackNavigator, or use the withNavigation function. However because of how React's context API works, any component that uses withNavigation function must be below the StackNavigator in the component tree.

如果无论组件树中的位置如何，仍要访问navigation道具，则必须将引用存储到模块中的StackNavigator.以下来自react-navigation的指南将帮助您 https://reactnavigation. org/docs/en/navigating-without-navigation-prop.html

If you still want to access the navigation prop regardless of the position in component tree, you will have to store the ref to the StackNavigator in a module. Following guide from react-navigation will help you do that https://reactnavigation.org/docs/en/navigating-without-navigation-prop.html

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