javascript 反应原生基础

Posted 2021-05-03

// SOURCE: https://facebook.github.io/react-native/docs/props
class Greeting extends Component {
  render() {
    return (
      <View style={{alignItems: 'center'}}>
        <Text>Hello {this.props.name}!</Text>
      </View>
    );
  }
}

export default class LotsOfGreetings extends Component {
  render() {
    return (
      <View style={{alignItems: 'center'}}>
        <Greeting name='Rexxar' />
        <Greeting name='Jaina' />
        <Greeting name='Valeera' />
      </View>
    );
  }
}

// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => LotsOfGreetings);

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

class Blink extends Component {
  constructor(props) {
    super(props);
    this.state = { isShowingText: true };

    // Toggle the state every second
    setInterval(() => (
      this.setState(previousState => (
        { isShowingText: !previousState.isShowingText }
      ))
    ), 1000);
  }

  render() {
    if (!this.state.isShowingText) {
      return null;
    }

    return (
      <Text>{this.props.text}</Text>
    );
  }
}

export default class BlinkApp extends Component {
  render() {
    return (
      <View>
        <Blink text='I love to blink' />
        <Blink text='Yes blinking is so great' />
        <Blink text='Why did they ever take this out of HTML' />
        <Blink text='Look at me look at me look at me' />
      </View>
    );
  }
}

// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => BlinkApp);

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

const styles = StyleSheet.create({
  bigBlue: {
    color: 'blue',
    fontWeight: 'bold',
    fontSize: 30,
  },
  red: {
    color: 'red',
  },
});

export default class LotsOfStyles extends Component {
  render() {
    return (
      <View>
        <Text style={styles.red}>just red</Text>
        <Text style={styles.bigBlue}>just bigBlue</Text>
        <Text style={[styles.bigBlue, styles.red]}>bigBlue, then red</Text>
        <Text style={[styles.red, styles.bigBlue]}>red, then bigBlue</Text>
      </View>
    );
  }
}

// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => LotsOfStyles);

// Have the component expand and shrink dynamically based on available space
// The larger the flex given, the higher the ratio of space a component will take compared to its siblings.

import React, { Component } from 'react';
import { AppRegistry, View } from 'react-native';

export default class FlexDimensionsBasics extends Component {
  render() {
    return (
      // Try removing the `flex: 1` on the parent View.
      // The parent will not have dimensions, so the children can't expand.
      // What if you add `height: 300` instead of `flex: 1`?
      <View style={{flex: 1}}>
        <View style={{flex: 1, backgroundColor: 'powderblue'}} />
        <View style={{flex: 2, backgroundColor: 'skyblue'}} />
        <View style={{flex: 3, backgroundColor: 'steelblue'}} />
      </View>
    );
  }
}

// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => FlexDimensionsBasics);