static saveImageWithTag(tag: string, successCallback, errorCallback)
利用tag标签保存图像到相机相册。
@param {string} tag - 可以是我们所接受的三种标签中的任意一个:1、url 2、assets-library 标签 3、存储一个图像的内存中返回的标签
static getPhotos(params: object, callback: function, errorCallback: function)
利用来自设备中的本地相机相册的图片识别对象来调用 callback 函数,通过 getPhotosReturnChecker 来定义匹配类型。
@param {object} params -见 getPhotosParamChecker 。@param {function} callback -通过 getPhotosReturnChecker 定义自变量的类型调用成功。@param {function} errorCallback - 通过错误消息调用失败。
'use strict';
var react = require('react-native');
var {
CameraRoll,
Image,
SliderIOS,
StyleSheet,
SwitchIOS,
Text,
View,
} = React;
var CameraRollView = require('./CameraRollView.ios');
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={5}
groupTypes={this.state.groupTypes}
renderImage={this._renderImage}
/>
</View>
);
},
_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 (
<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>
);
},
_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 = '<CameraRollView>';
exports.description = 'Example component that uses CameraRoll to list user\'s photos';
exports.examples = [
{
title: 'Photos',
render(): ReactElement { return <CameraRollExample />; }
}
];