[[oktatas:telefon:react_native|< React Native]]

====== Saját komponens ======

  * **Szerző:** Sallai András
  * Copyright (c) Sallai András, 2021
  * Licenc: [[https://creativecommons.org/licenses/by-sa/4.0/|CC Attribution-Share Alike 4.0 International]]
  * Web: https://szit.hu

===== Szeparátor =====

<code javascript App.js>
const Separator = () => (
  <View style={styles.separator} />
);

const App = () => (
    <View style={styles.container}>
        <Text>Első</Text>
        <Separator />
        <Text>Második</Text>
    </View>
);


const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    marginHorizontal: 16,
  },
  separator: {
    marginVertical: 8,
    borderBottomColor: 'black',
    borderBottomWidth: StyleSheet.hairlineWidth,
    width: '100%',
  },
});

export default App;
</code>

===== Szöveg fejrésszel =====

<code javascript App.js>
import React from 'react';
import { StyleSheet, View } from 'react-native';
import { Text } from "react-native";
import Header from './components/header';

export default function App() {
  return (
    <View style={styles.container}>
      <Header />
      <Text style={styles.body}>Törzsrész</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  body: {
    fontSize: 22,
  }
});

</code>


A komponenst egy components nevű könyvtárba helyezzük le.

<code javascript components/header.js>
import React from "react";
import { StyleSheet, Text, View } from "react-native";

export default function Header() {
    return (
        <View style={styles.header}>
            <Text style={styles.title}>Fejrész</Text>
        </View>
    );
}

const styles = StyleSheet.create({
    header: {
        height: 80,
        width: '100%',
        backgroundColor: 'coral',
        position: 'absolute',
        top: 0,        
    },
    title: {
        fontSize: 32,
        textAlign: 'center',
        paddingTop: 10,
        fontWeight: 'bold',
        color: 'white',        
    },
});
</code>

===== Lista =====

==== A lista ====

<code javascript App.js>
import React from 'react';
import { StyleSheet, View } from 'react-native';
import { FlatList, Text } from "react-native";
import Header from './components/header';

const DATA = [
  { id: '1',    task: 'Angular tanulás' },
  { id: '2',    task: 'Laravel tanulás' },
];

const Item = ({ task }) => (
  <View style={styles.item}>
    <Text style={styles.task}>{task}</Text>
  </View>
);

export default function App() {
  
  const renderItem = ({ item }) => (
    <Item task={item.task} />
  );

  return (
    <View style={styles.container}>
      <Header />
      <FlatList 
        data={DATA}
        renderItem={renderItem}
        keyExtractor={item => item.id}
        style={styles.list}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  item: {
    padding: 10,
    backgroundColor: '#005588',
  },
  task: {
    color: 'white',
    fontSize: 32,
  },
  list: {
    width: '100%',
  },
});

</code>


==== Saját komponens ====

<code javascript components/header.js>
import React from "react";
import { StyleSheet, Text, View } from "react-native";

export default function Header() {
    return (
        <View style={styles.header}>
            <Text style={styles.title}>Tennivalók</Text>
        </View>
    );
}

const styles = StyleSheet.create({
    header: {
        height: 80,
        width: '100%',
        backgroundColor: 'coral',
        
    },
    title: {
        fontSize: 32,
        textAlign: 'center',
        paddingTop: 10,
    },
});
</code>