react-native-progress的使用

设置进度条及loading动画可以使用这个第三方react-native-progress，支持条形及环形，官方显示demo图片如下

GitHub地址为：https://github.com/imartingraham/react-native-progress

这个组件有四种进度条：

• Progress.Bar
• Progress.Pie
• Progress.Circle
• Progress.CircleSnail

一  安装：

$ npm install react-native-progress --save

1. 在ios上使用圆形进度条需要在Libraries目录下添加ART.xcodeproj，路径为node_modules/react-native/Libraries/ART，如图：

QQ20180104-160911@2x.png

QQ20180104-160636@2x.png

3.在Build Phases下找到Link Binary With Libraries，添加libART.a，如图：

QQ20180104-160516@2x.png

注：android系统npm完成后直接使用即可。

二  使用：

import React, {Component} from 'react';
import {StyleSheet, View, Text, InteractionManager} from 'react-native';
import {Actions, ActionConst} from 'react-native-router-flux';
import Button from "apsl-react-native-button"//自定义button
import {showMsg} from "../utils/Util"
import {getValue, save} from "../utils/FileUtil"
import NarBar from "../component/NarBar";

var Progress = require('react-native-progress');

export default class LoadingPage extends Component {
    /**初始化数据*/
    constructor(props) {
        super(props);
        this.state = {
            progress: 0,
            indeterminate: true,
        };
    }

    /**初始*/
    componentDidMount() {
        this.animate();
    }
    animate(){
        var progress = 0;
        this.setState({ progress });
        setTimeout(() => {
            this.setState({ indeterminate: false });
            setInterval(() => {
                progress += Math.random()/5;
                if(progress > 1) {
                    progress = 1;
                }
                this.setState({ progress });
            }, 1000);
        }, 1500);
    }
    /**结束*/
    componentWillUnmount() {
    }

    render() {
        return <View style={styles.base_view}>
            <NarBar onSelect={() => {
                Actions.pop()
            }}  title='loadingDemo'/>
            <Text style={styles.welcome}>Progress Example</Text>
            <Progress.Bar
                style={styles.progress}
                progress={this.state.progress}
                indeterminate={this.state.indeterminate}
            />
            <View style={styles.circles}>
                <Progress.Circle
                    style={styles.progress}
                    progress={this.state.progress}
                    size={84} // 圆的直径
                    unfilledColor="rgba(255,255,255,0.5)" // 剩余进度的颜色
                    color={"#008aff"} // 颜色
                    thickness={6} // 内圆厚度
                    showsText={true}//显示进度比文字
                    textStyle={{fontSize:14,color:'red'}}//设置文字样式
                    // indeterminate={this.state.indeterminate}
                />
                <Progress.Pie
                    style={styles.progress}
                    progress={this.state.progress}
                    indeterminate={this.state.indeterminate}
                />
                <Progress.Circle
                    style={styles.progress}
                    progress={this.state.progress}
                    // indeterminate={this.state.indeterminate}
                    direction="counter-clockwise"
                />
            </View>
            <View style={styles.circles}>
                <Progress.CircleSnail
                    style={styles.progress}
                    animating={this.state.indeterminate}//设置动画
                    hidesWhenStopped={true}//设置当停止动画时移除
                />
                <Progress.CircleSnail
                    style={styles.progress}
                    color={[
                        '#F44336',
                        '#2196F3',
                        '#009688',
                    ]}
                />
            </View>

        </View>;
    }
}

var styles = StyleSheet.create({
    base_view: {},
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10,
    },
    circles: {
        flexDirection: 'row',
        alignItems: 'center',
    },
    progress: {
        margin:10,
    }

});