react constructor & changeState örnek

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/**
* Sample React Native App
* https://github.com/facebook/react-native
*
* @format
* @flow
*/
 
import React,{Component} from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
    TouchableOpacity
 
} from 'react-native';
 
export default class App extends Component {
 
  constructor() {
    super();
    this.state ={
        name:'Cafer',
        year:1995
    };
  }
 
  changeState = () => {
      this.setState({
          name:'Ali',
          year: 1993
      },()=>{
          alert("Bilgiler Güncellendi")
      });
  }
 
  render(){
    const { name,year } = this.state;
    return (
      <View style={[style.welcome_are,{backgroundColor: 'green'}]}>
          <Text>{name} {year}</Text>
          <TouchableOpacity onPress={this.changeState}>
            <Text>Değiştir</Text>
          </TouchableOpacity>
      </View>
    )
  }
}
const style = StyleSheet.create({
  welcome_are:{paddingTop:150,backgroundColor:'red'}
});

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