ReactNative TextInputのチュートリアル

index.ios.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, {Component} from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  Image,
  TextInput,
  View,
} from 'react-native';

class AwesomeProject extends Component {
  constructor(props) {
    super(props);
    this.state = {
      text: ''
    };
  }
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
        {
          // JSの論理演算子の使い方について
          // http://qiita.com/Imamotty/items/bc659569239379dded55
          this.state.text.split(' ').map((word) => word && '🍕').join(' ')
        }
        </Text>
        <Text style={styles.welcome}>
          {this.state.text}
        </Text>
        <TextInput style={styles.textInput}
          // functionを登録してやってみたが、
          // this.setStateが見えないみたいでエラーになった
          onChangeText={(text) => this.setState({text})}/>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
  },
  textInput: {
    height: 40,
    borderColor: 'gray',
    borderWidth: 1,
  },
});

AppRegistry.registerComponent('AwesomeProject', () => AwesomeProject);