uniapp app 人脸识别（倒计时拍照，已封组件）

Posted 2022-05-11 奥特曼　

由于 小程序端 有camera组件 直接就可以调起摄像头 但是 app端是不支持这个标签的 所以只能用其他的方法 使用 nvue 中 live-pusher 组件

子组件 

<template>
	<div>
		<div class="livefater">
			<div style="width: 300px;height: 300px;border-radius: 150px;overflow: hidden;">
				<!-- orientation="horizontal" //设置垂直水平方向 -->
				<live-pusher id='livePusher' ref="livePusher" class="livePusher" url=""
					mode="SD" :muted="true" :enable-camera="true" :auto-focus="true" :beauty="1" whiteness="2"
					aspect="1:1" @statechange="statechange" @netstatus="netstatus" @error="error"></live-pusher>
			</div>
			<cover-image src="/static/image/gai1.png" class="gaiimg"></cover-image>
		</div>
		<view class="message" style="color: #fff;">
			<text class="info">message</text>
		</view>
	</div>
</template>

<script>
	export default 
		props: 
			time: 
				default: 5000,
				type: Number
			,
			message: 
				default: '识别中，请稍后...',
				type: String
			
		,
		data() 
			return 
		,
		mounted() 

			// 注意：需要在onReady中 或 onLoad 延时
			this.context = uni.createLivePusherContext("livePusher", this);
			var that = this
			uni.getSystemInfo(
				success: function(e) 
					// 计算导航栏高度
					that.statusBar = e.statusBarHeight
					// #ifndef MP  
					if (e.platform == 'android') 
						that.CustomBar = e.statusBarHeight + 50
					 else 
						that.CustomBar = e.statusBarHeight + 45
					
					console.log(that.statusBar)
					// #endif  
					// #ifdef MP-WEIXIN  
					let custom = wx.getMenuButtonBoundingClientRect()
					that.CustomBar = custom.bottom + custom.top - e.statusBarHeight

					// #endif  

					// #ifdef MP-ALIPAY  
					that.CustomBar = e.statusBarHeight + e.titleBarHeight
					// #endif  
				
			)
			setTimeout(() => 
				this.startPreview()
			)
		,
		methods: 
			// 拍照事件
			snapshot: function() 
				var that = this
				this.context.snapshot(
					success: (e) => 
						console.log(e.message, '拍照信息');
						this.$emit('faceImg', e.message)
					
				);
			,
			// 开启摄像头
			startPreview() 
				console.log("1")
				var that = this
				this.context.startPreview(
					success: (a) => 
						console.log("livePusher.startPreview:" + JSON.stringify(a));
						that.Timer = setInterval(function() 
							that.snapshot()
						, that.time)
					,
					fail(err) 
						console.log(err);
					
				);
			,
		,
	
</script>

<style>
	<style lang="less">page 
		background: #0c8cf9;
	

	.u-navbar__content__left 
		display: flex !important;
		align-items: center;
	

	.u_nav_slot 
		display: flex;
		align-items: center;
		flex-direction: row;
		color: rgba(0, 0, 0, 0.9);
		font-size: 14.4rpx;
		font-weight: 700;

	

	.text 
		margin-left: 1rpx;
		color: #fff;
		font-size: 16rpx;
	

	.box 
		z-index: 99;
		position: absolute;
		left: 35%;
		top: 25%;
		width: 250rpx;
		height: 250rpx;
		background: pink;
	

	.message 
		flex: 1;
		justify-content: center;
		align-items: center;
		font-weight: 700;
	

	.info 
		color: #fff !important;
		font-size: 20rpx;
	

	.livePusher 
		width: 300px;
		height: 300px;
	

	.livefater 
		display: -ms-flex;
		display: -webkit-flex;
		display: flex;
		justify-content: center;
		flex-direction: column;
		align-items: center;
		margin-top: 10rpx;
		margin-bottom: 50rpx;
		height: 350px;
	

	.gaiimg 
		width: 300px;
		height: 300px;
		margin-top: -300px;
	
</style>
</style>

由于 人脸一般是 原型 样式 但是默认的live-pusher 是正方形 而且层级是比较高的 其他普通元素标签是无法压住他的  但是 cover-imgae的图片是可以压上去的 

父组件

<TestingFace :time="5000" @faceImg="faceImg" :message="message"></TestingFace>

faceImg 就是子组件传过来的 图片 message 是传过去的内容  time是倒计时的拍照时间，具体内容可以根据内容去加逻辑   注意 子父组件都是 nvue