这一组件可以用在ScrollView或ListView内部,为其添加下拉刷新的功能。当ScrollView处于竖直方向的起点位置(scrollY: 0),此时下拉会触发一个onRefresh
事件。
属性
例子
'use strict';
const React = require('react');
const ReactNative = require('react-native');
const {
ScrollView,
StyleSheet,
RefreshControl,
Text,
TouchableWithoutFeedback,
View,
} = ReactNative;
const styles = StyleSheet.create({
row: {
borderColor: 'grey',
borderWidth: 1,
padding: 20,
backgroundColor: '#3a5795',
margin: 5,
},
text: {
alignSelf: 'center',
color: '#fff',
},
scrollview: {
flex: 1,
},
});
const Row = React.createClass({//每个item的布局
_onClick: function() {
this.props.onClick(this.props.data);
},
render: function() {
return (
<TouchableWithoutFeedback onPress={this._onClick} >/*TouchableWithoutFeedback 点击无响应效果没有任何视觉反馈 只支持一个子节点 多个子组件应该用一个View包装*/
<View style={styles.row}>
<Text style={styles.text}>
{this.props.data.text + ' (' + this.props.data.clicks + ' clicks)'}
</Text>
</View>
</TouchableWithoutFeedback>
);
},
});
const RefreshControlExample = React.createClass({
statics: {
title: '<RefreshControl>',
description: 'Adds pull-to-refresh support to a scrollview.'
},
getInitialState() {
return {
isRefreshing: false,
loaded: 0,
rowData: Array.from(new Array(20)).map(
(val, i) => ({text: 'Initial row ' + i, clicks: 0})),
};
},
_onClick(row) {
row.clicks++;
this.setState({
rowData: this.state.rowData,
});
},
render() {
const rows = this.state.rowData.map((row, ii) => {
return <Row key={ii} data={row} onClick={this._onClick}/>;
});
return (
<ScrollView
style={styles.scrollview}
refreshControl={
<RefreshControl
refreshing={this.state.isRefreshing}//是否正在刷新
onRefresh={this._onRefresh}//视图开始刷新时调用
tintColor="#ff0000" //刷新指示器的颜色 ios
title="Loading..." //刷新指示器下显示的文字 ios
titleColor="#00ff00" // ios
colors={['#ff0000', '#00ff00', '#0000ff']} // 刷新指示器的绘制颜色至少一种
progressBackgroundColor="#ffff00" //刷新指示器的背景颜色
/>
}>
{rows}
</ScrollView>
);
},
_onRefresh() {
this.setState({isRefreshing: true});
setTimeout(() => {
// prepend 10 items
const rowData = Array.from(new Array(10))
.map((val, i) => ({
text: 'Loaded row ' + (+this.state.loaded + i),
clicks: 0,
}))
.concat(this.state.rowData); //concat() 方法将传入的数组或非数组值与原数组合并,组成一个新的数组并返回.
this.setState({
loaded: this.state.loaded + 10,
isRefreshing: false,
rowData: rowData,
});
}, 5000);
},
});
module.exports = RefreshControlExample;