React Native:不变违规:此导航器缺少导航道具 [英] React Native: Invariant Violation: The navigation prop is missing for this navigator

问题描述

我的代码如下:

import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View} from 'react-native';
import {LoginNavigator} from './src/components/login/LoginNavigator'
import {MainNavigator} from './src/components/main/MainNavigator'
import FBSDK from 'react-native-fbsdk'
import {createSwitchNavigator} from 'react-navigation'

const { AccessToken } = FBSDK

export default class App extends Component {
  constructor(props) {
    super(props)

    this.state = {
      accessToken: null
    }
  }

  componentDidMount() {
    AccessToken.getCurrentAccessToken()
    .then((data) => {
      this.setState({
        accessToken: data.accessToken
      })
    })
    .catch(error => {
      console.log(error)
    })
  }

  render() {
    const Navigator = makeRootNavigator(this.state.accessToken)
    return <Navigator />
  }
}

const makeRootNavigator = (isLoggedIn) => {
  return createSwitchNavigator(
    {
      LoginNavigator: {
        screen: LoginNavigator
      },
      MainNavigator: {
        screen: MainNavigator
      }
    },
    {
      initialRouteName: isLoggedIn ? "MainNavigator" : "LoginNavigator"
    }
  )
}

我收到了上面的错误.由于我的导航器依赖于在构造函数中创建的变量，因此我需要通过 render() 来完成它.遵循 关于应用程序容器的 react-native 文档 没有帮助.

and I'm getting the error above. Since my Navigators depend on the variables created in construtor, I needed to do it via render(). Following react-native documentation on application containers didn't help.

推荐答案

在 react-navigation v3 中，你必须用 createAppContainer 包裹 makeRootNavigator.将您的代码更改为:

In react-navigation v3, you must wrap makeRootNavigator with createAppContainer. Change your code to :

render() {
   const Navigator = createAppContainer(makeRootNavigator(this.state.accessToken));
   return <Navigator />
}

并且不要忘记在文件顶部导入 createAppContainer

and don't forget to import createAppContainer on top of the file

import {createSwitchNavigator, createAppContainer} from 'react-navigation'

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