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breaking changes，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

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; 

然后在你的App.js文件中：

import Container from './ScreenContainer';

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

Answer 4

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 5

import React, { Component } from 'react';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import Home from './home';
import Details from './details';

const Root = createStackNavigator({

    home: { 

        screen: Home,
    },

    details: { 

        screen: Details,
    },

});

const container = createAppContainer(Root);
export default container;   

在你的App.js文件中用</container>引用它

Answer 6

我的代码位于底部

export default class App extends React.Component {
  render() {
    return (
      <View >
        <SimpleApp style={{ width: Dimensions.get("window").width }} />
      </View>
    );
  }
}

我只是用它代替它，它就像一个魅力。当然，这是因为反应导航库中的更新：

const App = createAppContainer(SimpleApp);
export default App;

此外，我还将createAppContainer库包含在顶部的react-navigation中。

Answer 7

这个是创建一个带有两个标签的底部导航器：

import {createBottomTabNavigator, createAppContainer} from 'react-navigation';

export class Home extends Component{
   //...
}

export class Settings extends Component{
   //...
}     

const navig = createBottomTabNavigator({
  Home: Home,
  Settings: Settings
});

const App = createAppContainer(navig);

export default App;