CameraRoll

方法

实例

'use strict';

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

var CameraRollView = require('./CameraRollView.ios');
var AssetScaledImageExampleView = require('./AssetScaledImageExample');

var CAMERA_ROLL_VIEW = 'camera_roll_view';

var CameraRollExample = React.createClass({

  getInitialState() {
    return {
      groupTypes: 'SavedPhotos',sliderValue: 1,bigImages: true,};
  },render() {
    return (
      <View>
        <SwitchIOS
          onValueChange={this._onSwitchChange}
          value={this.state.bigImages} />
        <Text>{(this.state.bigImages ? 'Big' : 'Small') + ' Images'}</Text>
        <SliderIOS
          value={this.state.sliderValue}
          onValueChange={this._onSliderChange}
        />
        <Text>{'Group Type: ' + this.state.groupTypes}</Text>
        <CameraRollView
          ref={CAMERA_ROLL_VIEW}
          batchSize={20}
          groupTypes={this.state.groupTypes}
          renderImage={this._renderImage}
        />
      </View>
    );
  },loadAsset(asset){
    this.props.navigator.push({
      title: 'Camera Roll Image',component: AssetScaledImageExampleView,backButtonTitle: 'Back',passProps: { asset: asset },});
  },_renderImage(asset) {
    var imageSize = this.state.bigImages ? 150 : 75;
    var imageStyle = [styles.image,{width: imageSize,height: imageSize}];
    var location = asset.node.location.longitude ?
      JSON.stringify(asset.node.location) : 'Unknown location';
    return (
      <TouchableOpacity onPress={ this.loadAsset.bind( this,asset ) }>
        <View key={asset} style={styles.row}>
          <Image
            source={asset.node.image}
            style={imageStyle}
          />
          <View style={styles.info}>
            <Text style={styles.url}>{asset.node.image.uri}</Text>
            <Text>{location}</Text>
            <Text>{asset.node.group_name}</Text>
            <Text>{new Date(asset.node.timestamp).toString()}</Text>
          </View>
        </View>
      </TouchableOpacity>
    );
  },_onSliderChange(value) {
    var options = CameraRoll.GroupTypesOptions;
    var index = Math.floor(value * options.length * 0.99);
    var groupTypes = options[index];
    if (groupTypes !== this.state.groupTypes) {
      this.setState({groupTypes: groupTypes});
    }
  },_onSwitchChange(value) {
    this.refs[CAMERA_ROLL_VIEW].rendererChanged();
    this.setState({ bigImages: value });
  }
});

var styles = StyleSheet.create({
  row: {
    flexDirection: 'row',flex: 1,},url: {
    fontSize: 9,marginBottom: 14,image: {
    margin: 4,info: {
    flex: 1,});

exports.title = 'Camera Roll';
exports.description = 'Example component that uses CameraRoll to list user's photos';
exports.examples = [
  {
    title: 'Photos',render(): ReactElement { return <CameraRollExample />; }
  }
];

效果