react-native开发实例之横向滚动且释放页面跳转

先看下效果图

QQ20161220-000532.gif

一个横向滚动的listview，footer经过定制，结合onScroll事件，当滚动超过一定范围提示释放即页面跳转。

代码如下

import React, {Component} from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    View,
    ListView,
    Dimensions,
    Image,
} from 'react-native';


// var dataArray = ["page one", "page two","page three","page four","page five","page six",];
var dataArray = ['page 1', 'page 2', 'page 3'];
var Screen_Width = Dimensions.get('window').width;
var Screen_Height = Dimensions.get('window').height;

const t1 = '滑动查看更多';
const t2 = '释放查看更多';

import image1 from '../../images/icon_back.png';
import image2 from '../../images/icon_go.png';


class LoadMoreFooter extends Component {
    render() {
        return (

            
                
                
                    {this.props.tips}
                
            

        );
    }
}

export default class ListViewDemo extends Component {

    // 构造
    constructor(props) {
        super(props);
        // 初始状态
        var ds = new ListView.DataSource({
            rowHasChanged: (row1, row2) => row1 != row2,
        });
        this.state = {
            dataSource: ds.cloneWithRows(dataArray),
            img: image1,
            tips: t1,
        };

    }


    _renderFooter() {
        return 
    }


    _toEnd() {


    }

    render() {
        return (


             {
                    this._listView = listView
                }}
                style={styles.container}
                dataSource={this.state.dataSource}
                renderRow={this._renderRow}
                horizontal={true}
                showsHorizontalScrollIndicator={false}
                pagingEnabled={true}
                onScroll={(event) => {
                    this._scroll(event);
                }}
                enableEmptySections={true}
                renderFooter={ this._renderFooter.bind(this) }
                onEndReached={ this._toEnd.bind(this) }
                onEndReachedThreshold={-1}
            >
            


        );
    }

    _renderRow(rowData) {
        return (
            
                
                    {rowData}
                
            
        );
    }

    _scroll(event) {
        var scrollView = event.nativeEvent;
        var x = scrollView.contentOffset.x;

        var SVNWidth = scrollView.layoutMeasurement.width;
        var contentSize = scrollView.contentSize.width;

        console.log(x + ", " + SVNWidth + ", " + contentSize);

        if (x > 0 && x + SVNWidth > contentSize + 20) {
            this.setState({
                img: image2,
                tips: t2,
            });

            setTimeout(function () {

            }, 1000);

        }

    }


}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#F5FCFF',
        height: 200,
        marginTop: 20,
    },

    cellStyle: {
        flex: 1,
        width: Screen_Width / 2,
        height: 200,
        justifyContent: 'center',
        alignItems: 'center',
        marginLeft: 10,
        backgroundColor: 'red',
    },

    textStyle: {
        fontSize: 25,
        color: 'yellow',
    },

    footer: {
        paddingLeft: 5,
        paddingRight: 5,
        width: 50,
        height: 200,
        backgroundColor: 'yellow',
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'center',
    },
    footerImg: {
        width: 20,
        height: 20,
    },
    footerTextCont: {
        height: 100,
        flexDirection: 'column',
        alignItems: 'center',
        justifyContent: 'center',
    },
    footerText: {
        flexWrap: 'wrap',
        width: 20,
        flex: 1,
    },

});

图片资源

icon_back.png

icon_go.png