uniapp H5实现签名

第一种:跳转签名页面

1、创建审核页面audit.vue

<template>
	<view>

		<uni-section title="">
			<view class="auditClass">
				<uni-forms :model="baseFormData" ref="baseFormRef" :rules="rules" label-position="top"
					labelWidth="80px">
					<uni-forms-item label="审核意见" required name="advice">
						<uni-easyinput type="textarea" v-model="baseFormData.advice" placeholder="请输入审核意见" />
					</uni-forms-item>
					<image :src='baseFormData.signUrl.replace(/[\r\n]/g, "")' v-if="baseFormData.signUrl"></image>
					<button type="primary" style="margin-bottom: 15px;" :disabled="isClick" @click="signBtn">签名</button>
					<button type="primary" :disabled="isClick" @click="submit('baseFormRef')">提交</button>
				</uni-forms>
			</view>
		</uni-section>

	</view>
</template>

<script>
	import config from '@/config';
	import {
		getUserProfile
	} from "@/api/system/user"
	const baseUrl = config.baseUrl;

	export default {
		data() {
			return {
				loading: false,
				user: {},
				// 基础表单数据
				baseFormData: {
					signUrl: '',
					advice: '',
				},
				isClick: false,
			}
		},
		computed: {

		},
		onLoad(options) {
			this.baseFormData.proId = options.proId;
		},
		onReady() {
			this.$refs.baseFormRef.setRules(this.rules)
		},
		onShow() {
			uni.$on("imageUrl", (data) => {
				console.log("接收事件imageUrl成功,data=", data);
				this.baseFormData.signUrl = data.imageUrl;
			});
		},
		methods: {
			getUser() {
				getUserProfile().then(response => {
					this.user = response.data
					this.getTableData();
				})
			},
			submit(ref) {
				let self = this;
				self.$refs[ref].validate().then(res => {
					console.log('success', res);
					if (self.baseFormData.signUrl == '' || self.baseFormData.signUrl == null) {
						uni.showToast({
							title: '请签名',
							icon: "error"
						});
					} else {
						self.isClick = true;
						uni.showLoading({
							title: '提交中'
						});
						uni.request({
							withCredentials: true,
							url: baseUrl + '',
							data: JSON.stringify(self.baseFormData),
							method: 'post',
							success: function(res) {
								console.log(res.data);
								self.isClick = false;
								uni.hideLoading();
								if (res.data.code == 0) {
									uni.showToast({
										title: res.data.msg,
										icon: "error"
									});
								} else {
									uni.navigateBack({
										delta: 1,
										success() {
											setTimeout(() => {
												uni.showToast({
													title: res.data.msg,
													icon: 'success'
												})
											}, 500)
										}
									});
								}
							}
						});
					}
				}).catch(err => {
					console.log('err', err);
				});
			},
			// 签名
			signBtn() {
				this.$tab.navigateTo('/pages/processAudit/sign');
			},

		}
	}
</script>

<style scoped>
	.auditClass {
		padding: 15px;
		background-color: #ffffff;
	}
</style>

2、创建签名页面sign.vue

<template>
	<view>
		<view class="main-content" @touchmove.stop.prevent="">
			<!-- 签字canvas -->
			<canvas class="mycanvas" id="mycanvas" canvas-id="mycanvas" @touchstart="touchstart" @touchmove="touchmove"
				@touchend="touchend"></canvas>
			<canvas class="mycanvas"
				:style="{ 'z-index': -1, width: `${screenWidth}px`, height: `${(screenWidth * screenWidth) / screenHeight}px` }"
				id="rotatCanvas" canvas-id="rotatCanvas"></canvas>

			<cover-view class="button-line">
				<cover-view class="save-button" @tap="finish">保存</cover-view>
				<cover-view class="clear-button" @tap="clear">清空</cover-view>
			</cover-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				ctx: '', //绘图图像
				points: [], //路径点集合
				screenWidth: '',
				screenHeight: '',
				img: '',
				isDraw: false,
			};
		},
		mounted() {
			this.createCanvas();
			uni.getSystemInfo({
				success: e => {
					this.screenWidth = e.screenWidth;
					this.screenHeight = e.screenHeight;
				}
			});
		},
		methods: {
			//创建并显示画布
			createCanvas() {
				this.showCanvas = true;
				this.ctx = uni.createCanvasContext('mycanvas', this);
				//设置画笔样式
				this.ctx.lineWidth = 2;
				this.ctx.lineCap = 'round';
				this.ctx.lineJoin = 'round';
			},
			//触摸开始,获取到起点
			touchstart(e) {
				this.isDraw = true
				let startX = e.changedTouches[0].x;
				let startY = e.changedTouches[0].y;
				let startPoint = {
					X: startX,
					Y: startY
				};
				this.points.push(startPoint);
				//每次触摸开始,开启新的路径
				this.ctx.beginPath();
			},
			//触摸移动,获取到路径点
			touchmove(e) {
				let moveX = e.changedTouches[0].x;
				let moveY = e.changedTouches[0].y;
				let movePoint = {
					X: moveX,
					Y: moveY
				};
				this.points.push(movePoint); //存点
				let len = this.points.length;
				if (len >= 2) {
					this.draw(); //绘制路径
				}
			},
			// 触摸结束,将未绘制的点清空防止对后续路径产生干扰
			touchend() {
				this.points = [];
			},
			/* ***********************************************
				#   绘制笔迹
				#	1.为保证笔迹实时显示,必须在移动的同时绘制笔迹
				#	2.为保证笔迹连续,每次从路径集合中区两个点作为起点(moveTo)和终点(lineTo)
				#	3.将上一次的终点作为下一次绘制的起点(即清除第一个点)
				************************************************ */
			draw() {
				let point1 = this.points[0];
				let point2 = this.points[1];
				this.points.shift();
				this.ctx.moveTo(point1.X, point1.Y);
				this.ctx.lineTo(point2.X, point2.Y);
				this.ctx.stroke();
				this.ctx.draw(true);
			},
			//清空画布
			clear() {
				this.isDraw = false
				this.ctx.clearRect(0, 0, this.screenWidth, this.screenHeight);
				this.ctx.draw(true);
			},
			//完成绘画并保存到本地
			finish() {
				if (this.isDraw) {
					uni.canvasToTempFilePath({
						canvasId: 'mycanvas',
						fileType: 'png',
						quality: 1, //图片质量
						success: res => {
							console.log("sign" + res.tempFilePath);
							this.rotate(res.tempFilePath);
						},
						complete: com => {}
					});
				} else {
					uni.$emit("imageUrl", {
						imageUrl: ''
					});
					uni.navigateBack();
				}
			},
			rotate(tempFilePath) {
				let that = this
				wx.getImageInfo({
					src: tempFilePath,
					success: (res1) => {
						let canvasContext = wx.createCanvasContext('rotatCanvas')
						let rate = res1.height / res1.width
						let width = 300 / rate
						let height = 300
						canvasContext.translate(height / 2, width / 2)
						canvasContext.rotate((270 * Math.PI) / 180)
						canvasContext.drawImage(tempFilePath, -width / 2, -height / 2, width, height)
						canvasContext.draw(false, () => {
							wx.canvasToTempFilePath({
								canvasId: 'rotatCanvas',
								fileType: 'png',
								quality: 1, //图片质量
								success(res) {
									console.log("====="+JSON.stringify(res))
									
									uni.$emit("imageUrl", {
										imageUrl: res.tempFilePath,
									});
									uni.navigateBack();
								}
							})
						})
					}
				})
			},

		}
	};
</script>
<style lang="scss" scoped>
	.main-content {
		width: 100vw;
		height: 100vh;
		background-color: red;
		position: fixed;
		top: 0rpx;
		left: 0rpx;
		z-index: 9999;
	}

	.mycanvas {
		width: 100vw;
		height: 100vh;
		background-color: #fafafa;
		position: fixed;
		left: 0rpx;
		top: 0rpx;
		z-index: 2;
	}

	.button-line {
		transform: rotate(90deg);
		position: fixed;
		bottom: 170rpx;
		left: -100rpx;
		width: 340rpx;
		height: 80rpx;
		display: flex;
		align-items: center;
		justify-content: space-between;
		z-index: 999;
		font-size: 34rpx;
		font-weight: 600;
	}

	.save-button {
		color: #ffffff;
		width: 150rpx;
		height: 80rpx;
		text-align: center;
		line-height: 80rpx;
		border-radius: 10rpx;
		background-color: #007aff;
	}

	.clear-button {
		color: #ffffff;
		width: 150rpx;
		height: 80rpx;
		text-align: center;
		line-height: 80rpx;
		border-radius: 10rpx;
		background-color: #aaaaaa;
	}
</style>

3、签名页面效果展示

第二种:签名页面嵌入

1、创建审核页面audit.vue

<template>
	<view>

		<uni-section title="">
			<view class="auditClass">
				<uni-forms :model="baseFormData" ref="baseFormRef" :rules="rules" label-position="top"
					labelWidth="80px">
					<uni-forms-item label="审核意见" required name="advice">
						<uni-easyinput type="textarea" v-model="baseFormData.advice" placeholder="请输入审核意见" />
					</uni-forms-item>
					<button type="primary" style="margin-bottom: 15px;" @click="signBtn">签名</button>
					<sign v-if='signShow' @closeCanvas="closeCanvas" @change="change"></sign>
					<button type="primary" @click="submit('baseFormRef')">提交</button>
				</uni-forms>
			</view>
		</uni-section>

	</view>
</template>

<script>
	import config from '@/config';
	import {
		getUserProfile
	} from "@/api/system/user"
	const baseUrl = config.baseUrl;

	import sign from './sign.vue'

	export default {
		components: {
			sign
		},
		data() {
			return {
				loading: false,
				user: {},
				// 基础表单数据
				baseFormData: {
					signUrl: '',
					advice: '',
				},
				signShow: false,
			}
		},
		computed: {

		},
		onLoad(options) {
			console.log("proId====" + options.proId)
			this.baseFormData.proId = options.proId;
		},
		onReady() {
			// 设置自定义表单校验规则,必须在节点渲染完毕后执行
			this.$refs.baseFormRef.setRules(this.rules)
		},
		methods: {
			submit(ref) {
				let self = this;
				self.$refs[ref].validate().then(res => {
					console.log('success', res);
					if (self.baseFormData.signUrl == '' || self.baseFormData.signUrl == null) {
						uni.showToast({
							title: '请签名',
							icon: "error"
						});
					} else {
						//获取表单数据并发送请求
						self.baseFormData.userId = self.user.userId;
						uni.request({
							withCredentials: true, // 加入这一行即可
							url: baseUrl + '/api/saveProcessAuditInfo',
							data: JSON.stringify(self.baseFormData),
							method: 'post',
							success: function(res) {
								console.log(res.data);
								if (res.data.code == 0) {
									uni.showToast({
										title: res.data.msg,
										icon: "error"
									});
								} else {
									uni.navigateBack({
										delta: 1,
										success() {
											setTimeout(() => {
												uni.showToast({
													title: res.data.msg,
													icon: 'success'
												})
											}, 500)
										}
									});
								}
							}
						});
					}
				}).catch(err => {
					console.log('err', err);
				});
			},
			// 签名
			signBtn() {
				this.signShow = true
			},
			// 关闭画布
			closeCanvas(e) {
				this.signShow = false
			},
			// 用户签名数据
			change(e) {
				console.log(e) //返回的base64地址
				this.baseFormData.signUrl = e;
			},

		}
	}
</script>

<style scoped>
	.auditClass {
		padding: 15px;
		background-color: #ffffff;
	}
</style>

2、创建签名页面sign.vue

<template>
	<view>
		<view class="box" :style="{height:height}">
			<view class="top">
				<canvas class="canvas-box" @touchstart='touchstart' @touchmove="touchmove" @touchend="touchend"
					canvas-id="myCanvas">
				</canvas>
				<view>请在此处签名</view>
			</view>
			<view class=" bottom">
				<uni-tag text="完成" mode="dark" @click="finish" />
				<uni-tag text="重签" mode="dark" @click="clear" />
				<uni-tag text="取消" mode="dark" @click="close" />
			</view>
		</view>
	</view>
</template>
 
<script>
	export default {
		data() {
			return {
				ctx: '', //绘图图像
				points: [], //路径点集合
				height: '200px', //高度
				canvasShoww: false, //提示
				isDraw: false,
			}
		},
		created() {
			let that = this
			// uni.getSystemInfo({
			// 	success: function(res) {
			// 		that.height = res.windowHeight + 'px';
			// 	},
			// });
		},
		mounted() {
			this.createCanvas()
		},
		methods: {
			//创建并显示画布
			createCanvas() {
				this.ctx = uni.createCanvasContext('myCanvas', this); //创建绘图对象
				//设置画笔样式
				this.ctx.lineWidth = 4;
				this.ctx.lineCap = 'round';
				this.ctx.lineJoin = 'round';
			},
 
			// 触摸开始
			touchstart(e) {
				// 在签名前调用禁用滚动
				this.disableScroll();
				this.isDraw = true
				let startX = e.changedTouches[0].x;
				let startY = e.changedTouches[0].y;
				let startPoint = {
					X: startX,
					Y: startY
				};
				this.points.push(startPoint);
				//每次触摸开始,开启新的路径
				this.ctx.beginPath();
			},
			// 移动
			touchmove(e) {
				let moveX = e.changedTouches[0].x;
				let moveY = e.changedTouches[0].y;
				let movePoint = {
					X: moveX,
					Y: moveY
				};
				this.points.push(movePoint); //存点
				let len = this.points.length;
				if (len >= 2) {
					this.draw(); //绘制路径
				}
 
			},
			// 触摸结束,将未绘制的点清空防止对后续路径产生干扰
			touchend(e) {
				// 在签名完成后调用启用滚动
				this.enableScroll();
				this.points = [];
			},
			//绘制笔迹
			draw() {
				let point1 = this.points[0];
				let point2 = this.points[1];
				this.points.shift();
				this.ctx.moveTo(point1.X, point1.Y);
				this.ctx.lineTo(point2.X, point2.Y);
				this.ctx.stroke();
				this.ctx.draw(true);
			},
			//清空画布
			clear() {
				let that = this;
				if (this.imageShow) {
					if (this.imageUrl) {
						this.imageUrl = '';
						this.imageShow = false;
 
					}
				} else {
					uni.getSystemInfo({
						success: function(res) {
							// 设置画笔样式
							let canvasw = res.windowWidth;
							let canvash = res.windowHeight;
							that.ctx.clearRect(0, 0, canvasw, canvash);
							that.ctx.draw(true);
						}
					});
				}
				this.createCanvas();
			},
			//关闭并清空画布
			close() {
				this.$emit('closeCanvas');
				this.createCanvas();
				this.clear();
			},
 
			//完成绘画并保存到本地
			finish() {
				if (this.isDraw) {
					let that = this;
					uni.canvasToTempFilePath({
							canvasId: 'myCanvas',
							success: function(res) {
								that.imageShow = true;
								that.imageUrl = res.tempFilePath;
								that.$emit('closeCanvas');
								that.$emit('change', res.tempFilePath);
								that.close();
							}
						},
						// this
					);
					return
				}
				this.$u.func.showToast({
					title: '请签名',
				})
			},
			// 禁用页面滚动
			disableScroll() {
			   var box=function(e){passive: false ;};
			                  document.body.style.overflow='hidden';
			                  document.addEventListener("touchmove",box,false);
			},
			// 启用页面滚动
			enableScroll() {
			  var box=function(e){passive: false };
			                  document.body.style.overflow=''; // 出现滚动条
			                  document.removeEventListener("touchmove",box,false);
			},
		}
	}
</script>
 
<style lang="scss" scoped>
	.box {
		width: 100%;
		margin-bottom: 50px;
		display: flex;
		flex-direction: column;
		background-color: #fff;
 
		.top {
			height: 95%;
			margin: 50rpx;
			border: 1px solid #000;
			position: relative;
 
 
 
			.canvas-box {
				width: 100%;
				height: 100%;
			}
		}
 
		.bottom {
			height: 5%;
			display: flex;
			align-items: flex-start;
			justify-content: space-around;
		}
	}
</style>

3、签名页面效果展示

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