Komponensek külön fájlban

Szerző: Sallai András
Copyright © Sallai András, 2021, 2023
Licenc: CC Attribution-Share Alike 4.0 International
Web: https://szit.hu

Rövidítés

Visual Studio Code rövidítés:

rfced

Valami.js

import React from 'react'
 
export default function Valami(props) {
 
 
    return (
        <>
 
        </>
    )
}

A függvény neve automatikusan felveszi a fájl nevét.

Komponens külön

Külön fájl

Készítsünk a projekt gyökér könyvtárában egy components nevű könyvtárat. Itt fogjuk elhelyezni a komponenseinket.

App.js

App.js

import React, { Component} from 'react';
import { View, StyleSheet, Button, Text } from 'react-native';
 
import Head from './components/head';
import Body from './components/body';
import Foot from './components/foot';
 
export default class App extends Component {
 
  render() {
    return (
 
      <View style={styles.container}>
        <Head />
        <Body />
        <Foot />
      </View>
 
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'skyblue',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

Komponensek

components/head.js

import React, { Component} from 'react';
import { View, StyleSheet, Text } from 'react-native';
 
export default class ComponentA extends Component {
  render() {
    return (
        <View style={styles.container}>
          <Text style={{fontSize: 34}}>Fejrész</Text>
        </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    padding: 20,
    backgroundColor: 'orange',
    alignItems: 'center',
    justifyContent: 'center',
    width: '100%'
  },
});

components/body.js

import React, { Component} from 'react';
import { View, StyleSheet, Text } from 'react-native';
 
export default class ComponentB extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text>Törzs</Text>
      </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
    width: '100%',
  },
});

components/foot.js

import React, { Component} from 'react';
import { View, StyleSheet, Text } from 'react-native';
 
export default class ComponentC extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text>Lábrész</Text>
      </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    height: 40,
    backgroundColor: 'green',
    alignItems: 'center',
    justifyContent: 'center',
    width: '100%',
  },
});

Gomb külön

Saját nyomógomb forráskódja:

components/Button.js

import React from 'react';
import { Text, View, TouchableHighlight } from 'react-native';
import styles from './Button.style';
 
export default ({title, onPress}) => {
  return (
    <View style={styles.container}>
        <TouchableHighlight
            style={styles.runButton}
            onPress={onPress}
            >
            <Text style={styles.runText}>{title}</Text>
        </TouchableHighlight>
    </View>
  );
}

A hozzátartozó stílus:

components/Button.style.js

import { StyleSheet } from 'react-native';
 
export default StyleSheet.create({
  container: {
 
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  runButton: {
    backgroundColor: 'blue',
    margin: 5,
    padding: 10,
    borderRadius: 3,
  },
  runText: {
    color: 'white',
    paddingLeft: 10,
    paddingRight: 10,
    fontSize: 32,
  }
});

Felhasználás:

App.js

//...
import Button from './components/Button';
 
//...
 
function handlePress() {
   //tevékenység
}
 
//...
<Button title='Felirat' onPress={handlePress} />