[[oktatas:telefon:react_native:nezetek_kapcsolasa|< Nézetek kapcsolása]]

====== Nézetek kapcsolása osztályból ======

  * **Szerző:** Sallai András
  * Copyright (c) Sallai András, 2021, 2022
  * Licenc: [[https://creativecommons.org/licenses/by-sa/4.0/|CC Attribution-Share Alike 4.0 International]]
  * Web: https://szit.hu

===== Osztállyal =====

==== App.js ====


<code javascript App.js>
import React, { Component} from 'react';
import { View, StyleSheet, Button, Text } from 'react-native';

import ComponentA from './components/componenta';
import ComponentB from './components/componentb';
import ComponentC from './components/componentc';

export default class App extends Component {

  state = {
    selectedTab: ''
  }

  setTab = (tab) => {
    this.setState({selectedTab: tab});
  }
  selectTab = () => {
    
    switch(this.state.selectedTab) {
      case 'A':
        return <ComponentA />
      case 'B':
        return <ComponentB />
      case 'C':
        return <ComponentC />
      default:
        return
    }
  }
  render() {
    return (
      
      <View style={styles.container}>
        <View style={styles.buttonBox}>
          <Button onPress={() => this.setTab('A')} title='A' />
          <Button onPress={() => this.setTab('B')} title='B' 
            color='blue'
          />
          <Button onPress={() => this.setTab('C')} title='C' />
          <View style={styles.component}>
            {this.selectTab()}
          </View> 
        </View>
      </View>
  
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'skyblue',
    alignItems: 'center',
    justifyContent: 'center',
  },
  buttonBox: {
    flex: 1,
    width: '100%',
  },
  component: {
    flex: 1,
  }
});

</code>


==== Komponensek ====

<code javascript components/componenta.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>A komponens</Text>
        </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
</code>


<code javascript components/componentb.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>B komponens</Text>
      </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
</code>

<code javascript components/componentc.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>C komponens</Text>
      </View>
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
</code>