基础篇章：关于 React Native之 ActivityIndicator 组件的讲解

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

export default class ActivityIndicatorDemo extends Component {
  render() {
    return (
      <View style={styles.container}>
       <ActivityIndicator
            size="large"
            color="#0000ff"
          />
          <ActivityIndicator
            style={{marginTop:30}}
            size="small"
            color="#ff00ff"
          />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
});

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