uni-app低成本封装一个取色器组件的简单方法

在uni-ui中找不到对应的工具

后面想想也是 移动端取色干什么？

没办法 也挂不住特殊需求

因为去应用市场下载 这总东西 又不是很有必要

那么 下面这个组件或许能解决您的烦恼

<template>	<view>		<view>			<view id="colorBg" @touchstart="startTouch" @touchmove="moveIng"				@touchend="endTouch">				<view :catchtouchmove="true" @c.stop="()=>{}" :style=""transform:rotate(" +degrees +"deg)""></view>				<view :style=""color:"+getColorByDeg(this.degrees)">拖转轮播取色</view>			</view>			<view>				<button @click.stop = "close" type="default">取消</button>				<button @click.stop = "readColor" type="default">确认</button>			</view>		</view>	</view></template><script>	export default {		data() {			return {				pointerShow: true,				colorPanWidth: 20,				colorPanRadius: 0,				pointerBox: {},				degrees: 0			}		},		mounted() {			uni.getSystemInfo({				success: (res) => {					uni.createSelectorQuery().select("#colorBg").boundingClientRect((rect) => {						this.pointerBox = rect					}).exec()					this.colorPanRadius = res.screenWidth * 0.4				}			})		},		methods: {			close(){this.$emit("close");			},			readColor(){				let colro = this.getColorByDeg(this.degrees);				this.$emit("change",colro);			},    rbg2Hex(r, g, b) {return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);    },    calculationScheme(deg) {      deg = 360- deg + 120		      const r = Math.round(Math.sin((deg * 2 * Math.PI) / 360) * 255)		      const g = Math.round(Math.sin(((deg + 120) * 2 * Math.PI) / 360) * 255)		      const b = Math.round(Math.sin(((deg + 240) * 2 * Math.PI) / 360) * 255)      return this.colorRgbToHex(`rgb(${r},${g},${b})`);    },			startTouch(e) {				const {					pageX,					pageY				} = e.touches[0]				this.rotatePointer(pageX, pageY)			},			endTouch(e) {				const {					pageX,					pageY				} = e.changedTouches[0]				this.rotatePointer(pageX, pageY)			},			moveIng(e) {				const {					pageX,					pageY				} = e.touches[0]				this.rotatePointer(pageX, pageY)			},			rotatePointer(pageX = 0, pageY = 0) {				const {					pointerBox,					colorPanWidth				} = this				const mouseX = pageX - colorPanWidth				const mouseY = pageY - colorPanWidth				var centerY = pointerBox.top + (pointerBox.height / 2) - 0,					centerX = pointerBox.left + (pointerBox.height / 2) - 0,					radians = Math.atan2(mouseX - centerX, mouseY - centerY)				this.degrees = (radians * (180 / Math.PI) * -1) + 180;			},		     getColorByDeg(deg) {		      deg = 360- deg + 120		      const r = Math.round(Math.sin((deg * 2 * Math.PI) / 360) * 255)		      const g = Math.round(Math.sin(((deg + 120) * 2 * Math.PI) / 360) * 255)		      const b = Math.round(Math.sin(((deg + 240) * 2 * Math.PI) / 360) * 255)		      return `rgb(${r},${g},${b})`		    },			colorRgbToHex(rgbStr) {				const reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6}|[0-9a-fA-f]{8}|[0-9a-fA-f]{6}[0-9]{2})$/;				if (reg.test(rgbStr)) {					return rgbStr				} else {					const rgbArray = rgbStr.replace(/(?:\(|\)|rgba|rgb|RGBA|RGB)*/g, "").split(",");					let strHex = "#";					for (let i = 0; i < rgbArray.length; i++) {					if (i !== 3) {						if (rgbArray[i] == "0") {						    strHex += "00"						} else {						    let newItem =Number(rgbArray[i]).toString(16)						if (newItem.length < 2){							newItem = "0" + newItem						}						    strHex += newItem						}							} else {						strHex += rgbArray[i] == "0" ? "" : Number(rgbArray[i]) * 100					}					}					return strHex;				}			}		}	}</script><style>	.dialog {		display: block;		border-radius: 30rpx;		background-color: #303030;		margin: 20rpx;		padding: 30rpx;	}	.flex {		display: flex;		justify-content: space-between;	}	.colorBg {		width: 80vw;		height: 80vw;		margin: 5vw;		background: conic-gradient(red,				yellow,				lime,				aqua,				blue,				fuchsia,				red);		border-radius: 50%;		position: relative;		display: flex;		justify-content: center;		align-items: center;	}	.roundBuff {		width: 55vw;		height: 55vw;		-webkit-transform-origin: center 50%;		transform-origin: center 50%;		background: #303030;		border-radius: 50%;	}	.roundBuff::before {      content: "";      width: 15px;      height: 15px;	  background: #303030;      border: solid #303030;      border-width: 10px 10px 0 0;      transform: translate(-50%, -50%) rotate(-45deg);      position: absolute;      left: 50%;      top: 2%;}	.lee_btn {		background: #00000000;		color: #FFFFFF;		width: 36%;		height: 80rpx;		line-height: 70rpx;		text-align: center;		justify-content: center;		font-size: 30rpx;		border-radius: 50rpx;		border: 5rpx #FFFFFF solid;		font-weight: bold;		padding: 1px 20px;	}	.colorPan {		position: absolute;		color: #FFFFFF;	}</style>

直接将整个组件复制过去 接口使用

组件有两个方法

• change 当你点击确定时触发 返回 RGB 色码
• close 当你点击取消时触发

总结

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