APIs 相机滚动

方法

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。

例子

    '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 />; }
      }
    ];

链接: https://fly63.com/course/16_898