如何在React Native中将路由与React导航一起使用

r囧r小猫 2022-12-07 11:54 146阅读 0赞

### 介绍 **(**Introduction**)** ###

[React Navigation][] is a popular library for routing and navigation in a [React Native][] application.

[React Navigation][]是一个流行的库，用于在[React Native][]应用程序中进行路由和导航。

This library helps solve the problem of navigating between multiple screens and sharing data between them.

该库有助于解决在多个屏幕之间导航以及在它们之间共享数据的问题。

At the end of this tutorial, you will have a rudimentary social network. It will display the number of connections a user has and provide a way to connect with additional friends. You will use this sample application to explore how to navigate mobile application screens using `react-navigation`.

在本教程的最后，您将拥有一个基本的社交网络。 它将显示用户具有的连接数，并提供与其他朋友连接的方式。 您将使用此示例应用程序来探索如何使用`react-navigation`导航移动应用程序屏幕。

## 先决条件 **(**Prerequisites**)** ##

To complete this tutorial, you’ll need:

要完成本教程，您需要：

*  A local development environment for Node.js. Follow [How to Install Node.js and Create a Local Development Environment][].
    
    Node.js的本地开发环境。 遵循[如何安装Node.js和创建本地开发环境][How to Install Node.js and Create a Local Development Environment] 。
 *  Familiarity with setting up your environment to create a new React Native project and use the iOS or Android simulators may be beneficial.
    
    熟悉设置环境以创建新的React Native项目并使用iOS或Android模拟器可能会有所帮助。

**Note:** If you worked with `react-navigation` in the past, you might encounter some differences. You can consult the documentation for guides on [migrating from 3.x][] and [migrating from 4.x][].

**注意：**如果您过去使用过`react-navigation` ，则可能会遇到一些差异。 您可以查阅文档以获取有关[从3.x][migrating from 3.x] [迁移][migrating from 4.x]和[从4.x迁移的][migrating from 4.x]指南。

This tutorial was verified with Node v14.7.0, `npm` v6.14.7, `react` v16.13.1, `react-native` v0.63.2, `@react-navigation/native` v5.7.3, and `@react-navigation/stack` v5.9.0.

本教程已通过Node v14.7.0， `npm` v6.14.7， `react` v16.13.1， `react-native` v0.63.2， `@react-navigation/native` v5.7.3和`@react-navigation/stack` v5.9.0进行了验证。

## 第1步—创建一个新的React Native App **(**Step 1 — Creating a New React Native App**)** ##

First, create a new React Native app by entering the following command in your terminal:

首先，通过在终端中输入以下命令来创建一个新的React Native应用程序：

*  npx react-native init MySocialNetwork --version 0.63.2
    
    npx react-native init MySocialNetwork-版本0.63.2

Then, navigate to the new directory:

然后，导航到新目录：

*  cd MySocialNetwork
    
    cd MySocialNetwork

And start the application for iOS:

并启动适用于iOS的应用程序：

*  npm run ios
    
    npm运行ios

Alternatively, for Android:

另外，对于Android：

*  npm run android
    
    npm运行android

**Note:** If you experience any problems, you may need to consult [troubleshooting issues for React Native CLI][].

**注意：**如果遇到任何问题，您可能需要咨询[React Native CLI的故障排除问题][troubleshooting issues for React Native CLI] 。

This will create a skeleton project for you. It doesn’t look much like a social network right now. Let’s fix that.

这将为您创建一个骨架项目。 目前，它看起来不太像社交网络。 让我们修复它。

Open up `App.js`:

打开`App.js` ：

*  nano App.js
    
    纳米App.js

Replace the contents of `App.js` with the following code to display a welcome message:

用以下代码替换`App.js`的内容以显示欢迎消息：

App.js

import React from 'react';
    import { StyleSheet, Text, View } from 'react-native';
    
    class App extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>Welcome to MySocialNetwork!</Text>
          </View>
        );
      }
    }
    
    const styles = StyleSheet.create({
      container: {
        flex: 1,
        backgroundColor: '#fff',
        alignItems: 'center',
        justifyContent: 'center',
      },
    });
    
    export default App;

Save the file. Now, when you run the application, a **Welcome to MySocialNetwork!** message will appear in your simulator.

保存文件。 现在，当您运行该应用程序时， **欢迎使用MySocialNetwork！** 消息将出现在您的模拟器中。

In the next step, you will add more screens to your application.

在下一步中，您将向应用程序添加更多屏幕。

## 步骤2 —创建一个`HomeScreen`和`FriendsScreen` **(**Step 2 — Creating a `HomeScreen` and `FriendsScreen`**)** ##

Currently, you have a single screen displaying a welcome message. In this step, you will create the two screens for your application: `HomeScreen` and `FriendsScreen`.

当前，您只有一个屏幕，显示欢迎消息。 在此步骤中，您将为应用程序创建两个屏幕： `HomeScreen`和`FriendsScreen` 。

### `HomeScreen` **(**`HomeScreen`**)** ###

Your app will need a `HomeScreen`. The `HomeScreen` will display the number of friends already in your network.

您的应用将需要一个`HomeScreen` 。 在`HomeScreen`将在您的网络中已经显示了好友的号码。

Take the code from `App.js` and add it to a new file called `HomeScreen.js`:

从`App.js`获取代码，并将其添加到名为`HomeScreen.js`的新文件中：

*  cp App.js HomeScreen.js
    
    cp App.js HomeScreen.js

Open `HomeScreen.js`:

打开`HomeScreen.js` ：

*  nano HomeScreen.js
    
    纳米HomeScreen.js

Modify `HomeScreen.js` to use `HomeScreen` instead of `App`:

修改`HomeScreen.js`以使用`HomeScreen`代替`App` ：

HomeScreen.js

import React from 'react';
    import { StyleSheet, Text, View } from 'react-native';
    
    class HomeScreen extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>You have (undefined) friends.</Text>
          </View>
        );
      }
    }
    
    // ...
    
    export default HomeScreen;

This code will produce a **You have (undefined) friends.** placeholder message. You will provide a value later.

这段代码将产生一个“ **您有(未定义)朋友”。** 占位符消息。 稍后您将提供一个值。

### `FriendsScreen` **(**`FriendsScreen`**)** ###

Your app will also need a `FriendsScreen`. On the `FriendsScreen` you will be able to add new friends.

您的应用还需要一个`FriendsScreen` 。 在`FriendsScreen`您可以添加新朋友。

Take the code from `App.js` and add it to a new file called `FriendsScreen.js`:

从取码`App.js`并将其添加到一个名为新文件`FriendsScreen.js` ：

*  cp App.js FriendsScreen.js
    
    cp App.js FriendsScreen.js

Open `FriendsScreen.js`:

打开`FriendsScreen.js` ：

*  nano FriendsScreen.js
    
    纳米FriendsScreen.js

Modify `FriendsScreen.js` to use `FriendsScreen` instead of `App`:

修改`FriendsScreen.js`以使用`FriendsScreen`代替`App` ：

FriendsScreen.js

import React from 'react';
    import { StyleSheet, Text, View } from 'react-native';
    
    class FriendsScreen extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>Add friends here!</Text>
          </View>
        );
      }
    }
    
    // ...
    
    export default FriendsScreen;

This code will produce an **Add friends here!** message.

此代码将**在此处**产生一个**添加朋友！** 信息。

At this point, you have a `HomeScreen` and `FriendsScreen`. However, there is no way to navigate between them. You will build this functionality in the next step.

此时，您有一个`HomeScreen`和`FriendsScreen` 。 但是，无法在它们之间进行导航。 您将在下一步中构建此功能。

## 第3步—将`StackNavigator`与React导航一起使用 **(**Step 3 — Using `StackNavigator` with React Navigation**)** ##

For navigating between screens, you will use a `StackNavigator`. A `StackNavigator` works exactly like a [call stack][]. Each screen you navigate to is pushed to the top of the stack. Each time you hit the back button, the screens pop off the top of the stack.

为了在屏幕之间导航，您将使用`StackNavigator` 。 `StackNavigator`工作原理完全类似于[调用堆栈][call stack] 。 导航到的每个屏幕都被推到堆栈的顶部。 每次您按下“后退”按钮时，屏幕都会弹出堆栈顶部。

First, install `@react-navigation/native`:

首先，安装`@react-navigation/native` ：

*  npm install @react-navigation/native@5.7.3
    
    npm安装@ react-navigation / native @ 5.7.3

Then, install `@react-navigation/stack` and its peer dependencies:

然后，安装`@react-navigation/stack`及其对等项依赖项：

*  npm install @react-navigation/stack@5.9.0 @react-native-community/masked-view@0.1.10 react-native-screens@2.10.1 react-native-safe-area-context@3.1.4 react-native-gesture-handler@1.7.0
    
    npm install @ react-navigation / stack @ 5.9.0 @ react-native-community / masked-view @ 0.1.10 react-native-screens @ 2.10.1 react-native-safe-area-context @ 3.1.4 react-本机手势处理程序@ 1.7.0

**Note:** If you are developing for iOS, you may need to navigate to the `ios` directory and run `pod install`.

**注意：**如果您正在为iOS开发，则可能需要导航到`ios`目录并运行`pod install` 。

Next, revisit `App.js`:

接下来，重新访问`App.js` ：

*  nano App.js
    
    纳米App.js

Add `NavigationContainer` and `createStackNavigator` to `App.js`:

将`NavigationContainer`和`createStackNavigator`添加到`App.js` ：

App.js

Then, replace the contents of `render`:

然后，替换`render`的内容：

App.js

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

Nested inside `<Stack.Navigator>`, add the `HomeScreen`:

嵌套在`<Stack.Navigator>` ，添加`HomeScreen` ：

App.js

This code creates a very small stack for your navigator with only one screen: `HomeScreen`.

此代码仅使用一个屏幕为`HomeScreen`创建一个很小的堆栈。

Nested inside `<Stack.Navigator>`, add the `FriendsScreen`:

嵌套内部`<Stack.Navigator>`添加`FriendsScreen` ：

App.js

import 'react-native-gesture-handler';
    import React from 'react';
    import { StyleSheet } from 'react-native';
    import { NavigationContainer } from '@react-navigation/native';
    import { createStackNavigator } from '@react-navigation/stack';
    import HomeScreen from './HomeScreen';
    import FriendsScreen from './FriendsScreen';
    
    const Stack = createStackNavigator();
    
    class App extends React.Component {
      render() {
        return (
          <NavigationContainer>
            <Stack.Navigator>
              <Stack.Screen
                name="Home"
                component={HomeScreen}
              />
              <Stack.Screen
                name="Friends"
                component={FriendsScreen}
              />
            </Stack.Navigator>
          </NavigationContainer>
        );
      }
    }
    
    // ...

This code adds the `FriendsScreen` to the navigator.

此代码将`FriendsScreen`添加到导航器。

**Note:** This differs from how `createStackNavigator` was used in previous versions of React Navigation.

**注意：**这与以前版本的React Navigation中使用`createStackNavigator`不同。

Now, the navigator is aware of your two screens.

现在，导航器知道了您的两个屏幕。

### 向主`HomeScreen`和`FriendsScreen` `HomeScreen`添加按钮 **(**Adding Buttons to `HomeScreen` and `FriendsScreen`**)** ###

Finally, add buttons to take you between your two screens.

最后，添加按钮以在两个屏幕之间切换。

In `HomeScreen.js`, add the following code:

在`HomeScreen.js` ，添加以下代码：

HomeScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    
    class HomeScreen extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>You have (undefined) friends.</Text>
    
            <Button
              title="Add some friends"
              onPress={() =>
                this.props.navigation.navigate('Friends')
              }
            />
          </View>
        );
      }
    }
    
    // ...

In `FriendsScreen.js`, add the following code:

在`FriendsScreen.js` ，添加以下代码：

FriendsScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    
    class FriendsScreen extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>Add friends here!</Text>
    
            <Button
              title="Back to home"
              onPress={() =>
                this.props.navigation.navigate('Home')
              }
            />
          </View>
        );
      }
    }
    
    // ...

Let’s talk about `this.props.navigation`. As long as your screen is included in the `StackNavigator`, it automatically inherits many useful props from the `navigation` object. In this case, you used `navigate` to move to a different page.

让我们来谈谈`this.props.navigation` 。 只要您的屏幕包含在`StackNavigator` ，它就会自动从`navigation`对象继承许多有用的道具。 在这种情况下，您使用`navigate`来移动到另一个页面。

![HomeScreen and FriendsScreen][]

If you open your simulator now, you can navigate between the `HomeScreen` and `FriendsScreen`.

如果现在打开模拟器，则可以在`HomeScreen`和`FriendsScreen`之间导航。

## 步骤4 —使用`Context`将数据传递到其他屏幕 **(**Step 4 — Using `Context` to Pass Data to Other Screens**)** ##

In this step, you will create an array of possible friends — `Alice`, `Bob`, and `Sammy` — and an empty array of current friends. You will also create functionality for the user to add possible friends to their current friends.

在此步骤中，您将创建一个可能的朋友数组`Alice` ， `Bob`和`Sammy`以及一个空数组的当前朋友。 您还将为用户创建将可能的朋友添加到其当前朋友的功能。

Open `App.js`:

打开`App.js` ：

*  nano App.js
    
    纳米App.js

Add `possibleFriends` and `currentFriends` to the component’s state:

添加`possibleFriends`和`currentFriends`到组件的状态：

App.js

// ...
    
    class App extends React.Component {
      constructor(props) {
        super(props)
        this.state = {
          possibleFriends: [
            'Alice',
            'Bob',
            'Sammy',
          ],
          currentFriends: [],
        }
      }
    
      // ...
    }
    
    // ...

Next, add a function to move a possible friend into the list of current friends:

接下来，添加一个功能以将可能的朋友移至当前朋友列表中：

App.js

// ...
    
    class App extends React.Component {
      constructor(props) {
        super(props)
        this.state = {
          possibleFriends: [
            'Alice',
            'Bob',
            'Sammy',
          ],
          currentFriends: [],
        }
      }
    
      addFriend = (index) => {
        const {
          currentFriends,
          possibleFriends,
        } = this.state
    
        // Pull friend out of possibleFriends
        const addedFriend = possibleFriends.splice(index, 1)
    
        // And put friend in currentFriends
        currentFriends.push(addedFriend)
    
        // Finally, update the app state
        this.setState({
          currentFriends,
          possibleFriends,
        })
      }
    
      // ...
    }
    
    // ...

At this point, you have finished building the functionality to add friends.

至此，您已经完成了添加好友的功能。

### 将`FriendsContext`添加到`App` **(**Adding `FriendsContext` to `App`**)** ###

Now you can add friends in `App.js`, but you will want to add them to `FriendsScreen.js` and have them display in `HomeScreen.js`. Since this project is built with React, you can inject this functionality into your screens with context.

现在，您可以添加好友`App.js` ，但你会希望将其添加到`FriendsScreen.js` ，并让他们在显示`HomeScreen.js` 。 由于该项目是使用React构建的，因此您可以将此功能与上下文一起注入到屏幕中。

**Note:** In previous versions of React Navigation, it was possible to use `screenProps` to share data between screens. In the current version of React Navigation, it is recommended to use [React Context][] to share data between screens.

**注意：**在以前版本的React Navigation中，可以使用`screenProps`在屏幕之间共享数据。 在当前版本的React Navigation中，建议使用[React Context][]在屏幕之间共享数据。

To avoid a circular reference, you will want a new `FriendsContext` file:

为了避免循环引用，您将需要一个新的`FriendsContext`文件：

*  nano FriendsContext.js
    
    纳米FriendsContext.js

Export `FriendsContext`:

导出`FriendsContext` ：

FriendsContext

import React from 'react';
    
    export const FriendsContext = React.createContext();

Open `App.js`:

打开`App.js` ：

*  nano App.js
    
    纳米App.js

Add the `FriendsContext`:

添加`FriendsContext` ：

App.js

import 'react-native-gesture-handler';
    import React from 'react';
    import { StyleSheet } from 'react-native';
    import { NavigationContainer } from '@react-navigation/native';
    import { createStackNavigator } from '@react-navigation/stack';
    import { FriendsContext } from './FriendsContext';
    import Home from './Home';
    import Friends from './Friends';
    
    const Stack = createStackNavigator();
    
    class App extends React.Component {
      // ...
    
      render() {
        return (
          <FriendsContext.Provider>
            <NavigationContainer>
              <Stack.Navigator>
                <Stack.Screen
                  name="Home"
                  component={Home}
                />
                <Stack.Screen
                  name="Friends"
                  component={Friends}
                />
              </Stack.Navigator>
            </NavigationContainer>
          </FriendsContext.Provider>
        );
      }
    }
    
    // ...

This code establishes `FriendsContext` as a new [`Context` object][Context_ object] and wraps the `NavigationContainer` in a `Context.Provider` component so any children in the component tree can subscribe to context changes.

此代码将`FriendsContext`建立为新的[`Context`对象][Context_ object] ，并将`NavigationContainer`包装在`Context.Provider`组件中，以便组件树中的所有子代都可以订阅上下文更改。

Since you are no longer using `View` or `Text`, it is possible to remove those imports from `react-native`.

由于不再使用`View`或`Text` ，因此可以从`react-native`删除这些导入。

You will need to provide a `value` to make data accessible by consumers:

您将需要提供一个`value`以使使用者可以访问数据：

App.js

// ...
    
    class App extends React.Component {
      // ...
    
      render() {
        return (
          <FriendsContext.Provider
            value={
              {
                currentFriends: this.state.currentFriends,
                possibleFriends: this.state.possibleFriends,
                addFriend: this.addFriend
              }
            }
          >
            <NavigationContainer>
              <Stack.Navigator>
                <Stack.Screen
                  name="Home"
                  component={Home}
                />
                <Stack.Screen
                  name="Friends"
                  component={Friends}
                />
              </Stack.Navigator>
            </NavigationContainer>
          </FriendsContext.Provider>
        );
      }
    }
    
    // ...

This will allow the `HomeScreen` and `FriendsScreen` to reference any context changes to `currentFriends` and `possibleFriends`.

这将允许`HomeScreen`和`FriendsScreen`引用任何上下文更改到`currentFriends`和`possibleFriends` `currentFriends` 。

Now you can work on referencing the context in your screens.

现在，您可以在屏幕上引用上下文。

### 添加`FriendsContext`到`HomeScreen` **(**Adding `FriendsContext` to `HomeScreen`**)** ###

In this step, you will set up the application to display the current friend count.

在此步骤中，您将设置应用程序以显示当前的朋友计数。

Open `HomeScreen.js`:

打开`HomeScreen.js` ：

*  nano HomeScreen.js
    
    纳米HomeScreen.js

And add the `FriendsContext`:

并添加`FriendsContext` ：

HomeScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    import { FriendsContext } from './FriendsContext';
    
    class HomeScreen extends React.Component {
      // ...
    }
    HomeScreen.contextType = FriendsContext;
    
    // ...

This code establishes a [`Class.contextType`][Class.contextType]. You can now access context in your screens.

此代码建立一个[`Class.contextType`][Class.contextType] 。 现在，您可以在屏幕中访问上下文。

For instance, let’s make your `HomeScreen` display how many `currentFriends` you have:

举例来说，我们让您的`HomeScreen`显示有多少`currentFriends`您有：

HomeScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    import { FriendsContext } from './FriendsContext';
    
    class Home extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>You have { this.context.currentFriends.length } friends!</Text>
    
            <Button
              title="Add some friends"
              onPress={() =>
                this.props.navigation.navigate('Friends')
              }
            />
          </View>
        );
      }
    }
    HomeScreen.contextType = FriendsContext;
    
    // ...

If you open your app up again in the simulator and view the `HomeScreen`, you will see the message: **You have 0 friends!**.

如果您在模拟器中再次打开您的应用程序并查看`HomeScreen` ，则会看到以下消息： **您有0个朋友！** 。

### 添加`FriendsContext`到`FriendsScreen` **(**Adding `FriendsContext` to `FriendsScreen`**)** ###

In this step, you will set up the application to display the possible friends and provide buttons for adding them to the current friends.

在此步骤中，您将设置应用程序以显示可能的朋友，并提供用于将其添加到当前朋友的按钮。

Next, open `FriendsScreen.js`:

接下来，打开`FriendsScreen.js` ：

*  nano FriendsScreen.js
    
    纳米FriendsScreen.js

And add the `FriendsContext`:

并添加`FriendsContext` ：

FriendsScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    import { FriendsContext } from './FriendsContext';
    
    class FriendsScreen extends React.Component {
      // ...
    }
    FriendsScreen.contextType = FriendsContext;
    
    // ...

This code establishes a `Class.contextType`.

此代码建立一个`Class.contextType` 。

Now, create a button to add friends in `FriendsScreen.js`:

现在，创建一个按钮以在`FriendsScreen.js`添加朋友：

FriendsScreen.js

import React from 'react';
    import { StyleSheet, Text, View, Button } from 'react-native';
    import { FriendsContext } from './FriendsContext';
    
    class Friends extends React.Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>Add friends here!</Text>
    
            {
              this.context.possibleFriends.map((friend, index) => (
                <Button
                  key={ friend }
                  title={ `Add ${ friend }` }
                  onPress={() =>
                    this.context.addFriend(index)
                  }
                />
              ))
            }
    
            <Button
              title="Back to home"
              onPress={() =>
                this.props.navigation.navigate('Home')
              }
            />
          </View>
        );
      }
    }
    FriendsScreen.contextType = FriendsContext;
    
    // ...

If you open your app up again in the simulator and view the `FriendsScreen`, you will see a list of friends to add.

如果您在模拟器中再次打开应用程序并查看`FriendsScreen` ，则会看到要添加的朋友列表。

![HomeScreen with 0 currentFriends and FriendScreen with 3 possibleFriends][]

If you visit the `FriendsScreen` and click on the button to add friends, you will see the list of `possibleFriends` decrease. If you visit the `HomeScreen`, you will see the number of friends increase.

如果您访问`FriendsScreen`并单击按钮添加朋友，您将看到“ `possibleFriends`朋友”列表减少。 如果您访问`HomeScreen` ，您会看到朋友数量增加。

You can now navigate between screens and share data between them.

您现在可以在屏幕之间导航并在屏幕之间共享数据。

## 结论 **(**Conclusion**)** ##

In this tutorial, you have created a sample React Native application with multiple screens. Using React Navigation, you devised a way to navigate between screens. Using React Context, you developed a way to share data between screens.

在本教程中，您创建了一个带有多个屏幕的示例React Native应用程序。 使用React Navigation，您设计了一种在屏幕之间导航的方法。 使用React Context，您开发了一种在屏幕之间共享数据的方法。

The complete [source code for this tutorial is available on GitHub][].

[本教程][source code for this tutorial is available on GitHub]的完整[源代码可在GitHub上找到][source code for this tutorial is available on GitHub] 。

If you want to dig deeper into React Navigation, check out [their documentation][].

如果您想更深入地了解React Navigation，请查看[其文档][their documentation] 。

React Navigation is not the only routing and navigation solution. There is also [React Native Navigation][], [React Native Router Flux][], and [React Router Native][].

React Navigation不是唯一的路由和导航解决方案。 还有[React Native导航][React Native Navigation] ， [React Native Router Flux][]和[React Router Native][] 。

If you’d like to learn more about React, take a look at our [How To Code in React.js][] series, or check out [our React topic page][] for exercises and programming projects.

如果您想了解有关React的更多信息，请查看我们的[React.js][How To Code in React.js]系列中的[How To Code][How To Code in React.js] ，或查看[我们的React主题页面][our React topic page]以获取练习和编程项目。

> 翻译自: [https://www.digitalocean.com/community/tutorials/react-react-native-navigation][https_www.digitalocean.com_community_tutorials_react-react-native-navigation]

[React Navigation]: https://reactnavigation.org/
[React Native]: https://facebook.github.io/react-native/
[How to Install Node.js and Create a Local Development Environment]: https://www.digitalocean.com/community/tutorial_series/how-to-install-node-js-and-create-a-local-development-environment
[migrating from 3.x]: https://reactnavigation.org/docs/4.x/upgrading-from-3.x/
[migrating from 4.x]: https://reactnavigation.org/docs/upgrading-from-4.x/
[troubleshooting issues for React Native CLI]: https://reactnative.dev/docs/environment-setup
[call stack]: https://en.wikipedia.org/wiki/Stack_%28abstract_data_type%29
[HomeScreen and FriendsScreen]: /images/20221123/209edfda4206450a964388e950a19056.png
[React Context]: https://www.digitalocean.com/community/tutorials/react-context-api
[Context_ object]: https://reactjs.org/docs/context.html
[Class.contextType]: https://reactjs.org/docs/context.html#classcontexttype
[HomeScreen with 0 currentFriends and FriendScreen with 3 possibleFriends]: /images/20221123/3531f9c2aa8f49a4927ae8776746ef50.png
[source code for this tutorial is available on GitHub]: https://github.com/do-community/MySocialNetwork
[their documentation]: https://reactnavigation.org/docs/en/getting-started.html
[React Native Navigation]: https://wix.github.io/react-native-navigation/
[React Native Router Flux]: https://github.com/aksonov/react-native-router-flux
[React Router Native]: https://reactrouter.com/native/guides/quick-start
[How To Code in React.js]: https://www.digitalocean.com/community/tutorial_series/how-to-code-in-react-js
[our React topic page]: https://www.digitalocean.com/community/tags/react
[https_www.digitalocean.com_community_tutorials_react-react-native-navigation]: https://www.digitalocean.com/community/tutorials/react-react-native-navigation