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React Native is a popular open-source framework used for building mobile applications using the ReactJS library. React Native allows developers to build native mobile apps for iOS and Android platforms using a single codebase written in JavaScript. In this article, we will explore the fundamental concepts of React Native programming, along with detailed examples.
Components are the building blocks of React Native apps. They are reusable pieces of code that can be used to build the user interface of an app. In React Native, there are two types of components: functional components and class components. Functional components are used for simple UI components, while class components are used for more complex UI components that require state management.
Example:
import React from 'react';
import { View, Text } from 'react-native';
const App = () => {
return (
<View><Text>Hello, World!</Text></View>
);
};
export default App;
Props are short for properties and are used to pass data between components in React Native. Props are read-only, meaning that they cannot be changed by the component that receives them. Props can be passed down to child components using the curly braces syntax.
Example:
import React from 'react';
import { View, Text } from 'react-native';
const App = () => {
return (
<View><Greeting name="John" /></View>
);
};
const Greeting = (props) => {
return (
<Text>Hello, {props.name}!</Text>
);
};
export default App;
State is used for managing dynamic data in React Native. Unlike props, state is mutable, meaning that it can be changed by the component that owns it. To change the state of a component, we use the setState method. Example:
import React, { useState } from 'react';
import { View, Text, Button } from 'react-native';
const App = () => {
const [count, setCount] = useState(0);
const handleIncrement = () => {
setCount(count + 1);
};
return (
<View><Text>You clicked {count} times</Text><Button title="Click me" onPress={handleIncrement} /></View>
);
};
export default App;
Styling: Styling in React Native is done using JavaScript, rather than CSS. React Native provides a set of built-in styles that can be used to style components, along with the ability to create custom styles using the StyleSheet API.
import React from 'react';
import { View, Text, StyleSheet } from 'react-native';
const App = () => {
return (
<View style={styles.container}><Text style={styles.text}>Hello, World!</Text></View>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
backgroundColor: '#fff',
},
text: {
fontSize: 20,
fontWeight: 'bold',
color: '#333',
},
});
export default App;
import React from 'react';
import { View, Text, Button } from 'react-native';
import { createStackNavigator } from '@react-navigation/stack';
import { NavigationContainer } from '@React Navigation';
const HomeScreen = ({ navigation }) => {
return (
<View>
<Text>Welcome to the home screen!</Text>
<Button
title="Go to Details"
onPress={() => navigation.navigate('Details')}
/>
</View>
);
};
const DetailsScreen = () => {
return (
<View>
<Text>Welcome to the details screen!</Text>
</View>
);
};
const Stack = createStackNavigator();
const App = () => {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home" component={HomeScreen} />
<Stack.Screen name="Details" component={DetailsScreen} />
</Stack.Navigator>
</NavigationContainer>
);
};
npx react-native init MyProject
cd MyProject
npm install axios react-native-elements
axios: A promise-based HTTP client for making API requests.react-native-elements: A UI library for React Native that provides pre-built components.components in the root directory of our project.Article.js in the components folder.Article.js file:
import React, { useState, useEffect } from 'react';
import { View, Text, TextInput, Button } from 'react-native';
import axios from 'axios';
const Article = () => {
const [title, setTitle] = useState('');
const [content, setContent] = useState('');
const [articles, setArticles] = useState([]);
const fetchArticles = async () => {
const response = await axios.get('https://my-api-url.com/articles');
setArticles(response.data);
};
useEffect(() => {
fetchArticles();
}, []);
const handleSave = async () => {
await axios.post('https://my-api-url.com/articles', { title, content });
setTitle('');
setContent('');
fetchArticles();
};
const handleDelete = async (id) => {
await axios.delete(`https://my-api-url.com/articles/${id}`);
fetchArticles();
};
return (
<View><Text>Articles</Text><TextInputvalue={title}onChangeText={(text) => setTitle(text)}
placeholder="Title"
/>
<TextInputvalue={content}onChangeText={(text) => setContent(text)}
placeholder="Content"
/>
<Button title="Save" onPress={handleSave} />
{articles.map((article) => (
<View key={article.id}><Text>{article.title}</Text><Text>{article.content}</Text><Buttontitle="Delete"onPress={() => handleDelete(article.id)}
/>
</View>
))}
</View>
);
};
export default Article;
useEffect hook to fetch the articles from the REST API when the component mounts.handleSave and handleDelete, to create and delete articles in the REST API.
npx react-native start
javaCopy code
npx react-native run-android
or
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npx react-native run-ios
npm install -g expo-cli
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expo login
expo publish
npm install -g @aws-amplify/cli
amplify init
amplify add api
amplify push
Article.js file to use the endpoint generated by Amplify.here are some top React Native learning links and books:
