不变违规:此导航器缺少导航道具

Question

当我尝试启动我的本机应用程序时,我收到此消息.通常这种格式适用于其他多屏幕导航,但在某种程度上不适用于这种情况.

这是错误:

Invariant Violation: The navigation prop is missing for this navigator. In 
react-navigation 3 you must set up your app container directly. More info: 
https://reactnavigation.org/docs/en/app-containers.html

这是我的应用格式:

import React, {Component} from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { createStackNavigator } from 'react-navigation';

import Login from './view/login.js'
import SignUp from './view/signup.js'

const RootStack = createStackNavigator(
  {
    Home: {
      screen: Login
    },
    Signup: {
      screen: SignUp
    }
  },
  {
    initialRouteName: 'Home'
  }

);

export default class App extends React.Component {
  render() {
    return <RootStack />;
  }
}

Answer 1

React Navigation 3.0有许多重大更改,包括根导航器所需的显式应用程序容器.

过去,任何导航器都可以充当应用程序顶层的导航容器,因为它们都包含在"导航容器"中.导航容器(现在称为app容器)是一个高阶组件,它维护应用程序的导航状态并处理与外部世界的交互,以将链接事件转换为导航操作等.

在v2及更早版本中,React Navigation中的容器由create*Navigator函数自动提供.从v3开始,您需要直接使用容器.在v3中,我们还将createNavigationContainer重命名为createAppContainer.

import {
  createStackNavigator,
  createAppContainer
} from 'react-navigation';
const MainNavigator = createStackNavigator({...});
const App = createAppContainer(MainNavigator);

一个更全面的代码示例:

import {
      createStackNavigator,
      createAppContainer
    } from 'react-navigation';
import Login from './view/login.js'
import SignUp from './view/signup.js'

const RootStack = createStackNavigator({
    Home: {
      screen: Login
    },
    Signup: {
      screen: SignUp
    }
  });

const App = createAppContainer(RootStack);

export default App;

Answer 2

@Tom Dickson是这样的:

import React, { Component } from 'react';
import { createStackNavigator, createAppContainer } from 'react-navigation';

import ScreenOne from './ScreenOne';
import ScreenTwo from './ScreenTwo';

const NavStack = createStackNavigator({
    ScreenOne: { 
        screen: ScreenOne,
    },
    ScreenTwo: { 
        screen: ScreenTwo,
    },
});

const App = createAppContainer(NavStack);

export default App;

然后用它来引用它

<App />

Answer 3

这是另一种方式

import React, {Component} from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { createStackNavigator,createAppContainer } from 'react-navigation';

import Login from './view/login.js'
import SignUp from './view/signup.js'

const RootStack = createStackNavigator(
  {
    Home: {
      screen: Login
    },
    Signup: {
      screen: SignUp
    }
  },
  {
    initialRouteName: 'Home'
  }

);

class App extends React.Component {
  render() {
    return <RootStack />;
  }
}

export default createAppContainer(RootStack);

Answer 4

创建一个新文件ScreenContainer.js（您可以选择名称）。然后在ScreenContainer文件中添加：

import React, { Component } from 'react';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import MainScreen from './MainScreen'; 
import AboutScreen from './AboutScreen';

const NavigationStack = createStackNavigator({
    Main: { 
        screen: MainScreen,
    },
    About: { 
        screen: AboutScreen,
    },
});

const Container = createAppContainer(NavigationStack);

export default Container; 

然后在您的App.js文件中：

import Container from './ScreenContainer';

class App extends Component {
  render() {
    return (
      <Container />
    );
  }
}

Answer 5

经过多次谷歌搜索后，我浪费了 2.5 个小时来获得这个解决方案......希望这会奏效。

只需导入这两个：

import { createStackNavigator } from "react-navigation-stack";
import { createAppContainer } from "react-navigation";

并对您的代码进行一些更改，如下所示：

在类上方创建 const

const AppNavigator = createAppContainer(RootStack);

最后在类中调用 const 而不是 <RootStack/>

<AppNavigator />

谢谢！