> [CameraRoll](http://facebook.github.io/react-native/docs/cameraroll.html#content) ## 方法 | 名称 | 作用 | | --- | --- | | saveImageWithTag | 保存图片到相册 | | getPhotos | 从相册中得到图片 | ## 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