React Native实现进度条弹框的示例代码
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2023-02-24 10:30:08
本文介绍了react native实现进度条弹框,分享给大家
我们在上传或者下载文件时候,希望有一个进度条弹框去提醒用户取当前正在上传或者下载,也允许用去取点击取消上...
本文介绍了react native实现进度条弹框,分享给大家
我们在上传或者下载文件时候,希望有一个进度条弹框去提醒用户取当前正在上传或者下载,也允许用去取点击取消上传或者下载。
首先实现进度条。
import react, { purecomponent } from 'react'; import { stylesheet, view, animated, easing, } from 'react-native'; class bar extends purecomponent { constructor(props) { super(props); this.progress = new animated.value(this.props.initialprogress || 0); } static defaultprops = { style: styles, easing: easing.inout(easing.ease) } componentwillreceiveprops(nextprops) { if (this.props.progress >= 0 && this.props.progress !== nextprops.progress) { this.update(nextprops.progress); } } shouldcomponentupdate() { return false; } update(progress) { animated.spring(this.progress, { tovalue: progress }).start(); } render() { return ( <view style={[styles.background, this.props.backgroundstyle, this.props.style]}> <animated.view style={[styles.fill, this.props.fillstyle, { width: this.progress.interpolate({ inputrange: [0, 100], outputrange: [0 * this.props.style.width, 1 * this.props.style.width], })} ]} /> </view> ); } } var styles = stylesheet.create({ background: { backgroundcolor: '#bbbbbb', height: 5, overflow: 'hidden' }, fill: { backgroundcolor: 'rgba(0, 122, 255, 1)', height: 5 } }); export default bar;
进度条的值我们用动画实现,避免使用state不断去重新render渲染界面,同时设置shouldcomponentupdate返回值为false,避免重新render。
实现进度条弹框。
import react, { proptypes, purecomponent } from 'react'; import { view, stylesheet, modal, text, dimensions, touchableopacity } from 'react-native'; import bar from './bar'; const { width } = dimensions.get('window'); class progressbardialog extends purecomponent { constructor(props) { super(props); } static proptypes = { ...modal.proptypes, title: proptypes.string, canclepress: proptypes.func, cancletext: proptypes.string, needcancle: proptypes.bool }; static defaultprops = { animationtype: 'none', transparent: true, progressmodalvisible: false, onshow: () => {}, onrequestclose: () => {}, onoutsidepress: () => {}, title: '上传文件', cancletext: '取消是', canclepress: () => {}, needcancle: true } render() { const { animationtype, transparent, onrequestclose, progress, title, canclepress, cancletext, needcancle, progressmodalvisible } = this.props; return ( <modal animationtype={animationtype} transparent={transparent} visible={progressmodalvisible} onrequestclose={onrequestclose}> <view style={styles.progressbarview}> <view style={styles.subview}> <text style={styles.title}> {title} </text> <bar ref={this.refbar} style={{marginleft: 10,marginright: 10,width:width - 80}} progress={progress} backgroundstyle={styles.barbackgroundstyle} /> <view style={styles.progresscontainer}> <text style={styles.progresslefttext}> {`${progress}`}% </text> <text style={styles.progressrighttext}> {`${progress}`}/100 </text> </view> {needcancle && <view style={styles.canclecontainer}> <touchableopacity style={styles.canclebutton} onpress={canclepress}> <text style={styles.cancletext}> {cancletext} </text> </touchableopacity> </view> } </view> </view> </modal> ); } } const styles = stylesheet.create({ progressbarview: { flex:1, justifycontent: 'center', alignitems: 'center', backgroundcolor: 'rgba(0,0,0,0.2)' }, barstyle: { marginleft: 10, marginright: 10, width:width - 80 }, progresslefttext: { fontsize: 14 }, canclecontainer: { justifycontent: 'center', alignitems: 'flex-end' }, progressrighttext: { fontsize: 14, color: '#666666' }, barbackgroundstyle: { backgroundcolor: '#cccccc' }, progresscontainer: { flexdirection: 'row', padding: 10, justifycontent: 'space-between' }, subview: { marginleft: 30, marginright: 30, backgroundcolor: '#fff', alignself: 'stretch', justifycontent: 'center' }, progressview: { flexdirection: 'row', padding: 10, paddingbottom: 5, justifycontent: 'space-between' }, title: { textalign: 'left', padding:10, fontsize: 16 }, canclebutton: { padding:10 }, cancletext: { textalign: 'right', paddingtop: 0, fontsize: 16, color: 'rgba(0, 122, 255, 1)' } }); export default progressbardialog;
props
- modal的props - 这些都是modal的属性
- animationtype - 动画类型
- transparent - 是否透明
- progressmodalvisible - 是否可见
- onshow - 弹框出现
- onrequestclose - 弹框请求消失(比如安卓按返回键会触发这个方法)
- onoutsidepress - 点击弹框外部动作
- title - 弹框的标题
- cancletext - 取消的文字
- canclepress - 取消动作
- needcancle - 是否需要取消按钮
使用代码
import react , { purecomponent } from 'react'; import { view } from 'react-native'; import progressbardialog from './progressbardialog'; class upload extends purecomponent { constructor(props) { this.state = { progress: 0, progressmodalvisible: false }; } refprogressbar = (view) => { this.progressbar = view; } showprogressbar = () => { this.setstate({ progressmodalvisible: true }); } dismissprogressbar = () => { this.setstate({ progress: 0, progressmodalvisible: false }); } setprogressvalue = (progress) => { this.setstate({ progress }); } onprogressrequestclose = () => { this.dismissprogressbar(); } canclepress = () => { this.dismissprogressbar(); } render() { return ( <view> <progressbardialog ref={this.refprogressbar} progress={this.state.progress} progressmodalvisible={this.state.progressmodalvisible} onrequestclose={this.onprogressrequestclose} canclepress={this.canclepress} needcancle={true} /> </view> ) } } export default upload;
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