gistfile1.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */
'use strict';

var React = require('react-native');
var {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  Image,
  CameraRoll
} = React;

var TestImagesLoadingTime = React.createClass({
  getInitialState: function(){
     return {};
  },
  componentDidMount: function(){
    CameraRoll.getPhotos({first: 1}, function(data){
        if (!data.edges.length) return;
        this.setState({
            picture: data.edges[0].node.image.uri
        });
    }.bind(this), console.log);
  },
  render: function() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.ios.js
        </Text>
        <Text style={styles.instructions}>
          Press Cmd+R to reload,{'\n'}
          Cmd+Control+Z for dev menu
        </Text>
        {
            this.state.picture &&
        <Image
            style={ styles.pic }
            source={ {uri: this.state.picture} }
        >
            <Text style={ styles.loading }>rendering { this.state.picture }…</Text>
        </Image>
        }
      </View>
    );
  }
}); //source={ {uri: "http://www.counterpunch.org/wp-content/dropzone/2014/09/KillingTrayvons_Cover1-291x450.jpg"} }

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
  loading: {
      fontSize: 12,
      color: 'grey'
  },
  pic: {
      height: 200,
      width: 200,
      borderWidth: 1,
      borderColor: 'red',
      justifyContent: 'center',
      alignItems: 'center'
  }
});

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