React Native实现进度条弹框的示例代码
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;
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。
相关文章
windows下create-react-app 升级至3.3.1版本踩坑记
这篇文章主要介绍了windows下create-react-app 升级至3.3.1版本踩坑记,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧2020-02-02react component changing uncontrolled in
这篇文章主要为大家介绍了react component changing uncontrolled input报错解决,有需要的朋友可以借鉴参考下,希望能够有所帮助,祝大家多多进步,早日升职加薪2022-12-12解决React报错useNavigate() may be used only in context of
这篇文章主要为大家介绍了解决React报错useNavigate() may be used only in context of Router,有需要的朋友可以借鉴参考下,希望能够有所帮助,祝大家多多进步,早日升职加薪2022-12-12使用ReactJS实现tab页切换、菜单栏切换、手风琴切换和进度条效果
这篇文章主要介绍了使用ReactJS实现tab页切换、菜单栏切换、手风琴切换和进度条效果的相关资料,非常不错,具有一定的参考借鉴价值,需要的朋友可以参考下2016-10-10
最新评论