ReactNative实现一个圆环进度条

我们直接看效果，如下图

我们在直接上代码

/*** 圆形进度条*/
import React, {useState, useEffect} from 'react';
import Svg, {Circle,G,LinearGradient,Stop,Defs,Text,
} from 'react-native-svg';
import {View, StyleSheet} from 'react-native';// 渐变色
const CircleProgress = props => {const {progress, durationTime, children, customeSvgSize, customeStrokeWidth} =props;let svgSize = customeSvgSize ? customeSvgSize : 200; // 画布的宽高const halfOfSvgSize = svgSize / 2;const strokeWidth = customeStrokeWidth ? customeStrokeWidth : 10; // 圆形进度条宽度const radius = (svgSize - strokeWidth) / 2; // 外层半径const innerRadius = radius - 6; // 内层半径const circumference = 2 * radius * Math.PI; // 总周长// 背景色，圆环const linearGradientColors = [{stop: '0%', color: '#36B5AA'},{stop: '50%', color: '#317AF7'},{stop: '100%', color: '#3396D2'},];const circumferenceWithProgress = circumference * (1 - progress);const outerCircleCommonConfig = {fill: 'none',cx: halfOfSvgSize,cy: halfOfSvgSize,r: radius,strokeLinecap: 'round',strokeWidth: strokeWidth,strokeDasharray: `${circumference}  ${circumference}`,};const [count, setCount] = useState(durationTime);return (<View><Svg width={svgSize} height={svgSize}><Defs><LinearGradient x1="100%" y1="100%" x2="0%" y2="0%" id="gradient">{linearGradientColors.map((item, index) => (<Stop key={index} offset={item.stop} stopColor={item.color} />))}</LinearGradient></Defs><G rotation={-90} origin={`${halfOfSvgSize}, ${halfOfSvgSize}`}><Circle stroke="#D2D2D2" {...outerCircleCommonConfig} /><Circlestroke="url(#gradient)"fill="none"{...outerCircleCommonConfig}strokeDashoffset={circumferenceWithProgress}/></G></Svg><Viewstyle={[{width: svgSize, height: svgSize}, styles.pa, styles.center]}>{children}</View></View>);
};
const styles = StyleSheet.create({main: {flexDirection: 'row',},pa: {position: 'absolute',top: 0,left: 0,},center: {justifyContent: 'center',alignItems: 'center',},
});
export default CircleProgress;

注意：1.需要引入react-native-svg库，因为我们用到的是SVG

2.另外圆环是使用Circle实现，另外使用到了G，用来旋转，不旋转的话，看下图