fix:连拍改用WebRTC,解决createCameraContext未实现问题
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97694732@qq.com
parent
81d559ccb7
commit
1ee3a0a274
@ -1,8 +1,12 @@
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<template>
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<view class="cc-page">
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<!-- 摄像头预览区 -->
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<!-- 摄像头预览区（WebRTC） -->
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<view class="cc-camera-wrap">
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<camera id="ccCamera" class="cc-camera" device-position="back" flash="off" @error="onCameraError"></camera>
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<video id="ccVideo" class="cc-video" autoplay playsinline muted></video>
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<canvas id="ccCanvas" class="cc-canvas" style="display:none;"></canvas>
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<view class="cc-camera-hint" v-if="!ctxReady">
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<text class="cc-hint-text">{{ hintText }}</text>
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</view>
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</view>
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<!-- 已拍照九宫格 -->
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@ -37,71 +41,92 @@
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data() {
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return {
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capturedList: [],
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ctx: null
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mediaStream: null,
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ctxReady: false,
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hintText: '摄像头启动中...'
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}
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},
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onReady() {
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this.getCameraContext()
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this.startCamera()
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},
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onUnload() {
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this.stopCamera()
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},
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methods: {
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getCameraContext() {
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startCamera() {
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var that = this
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this.hintText = '摄像头启动中...'
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try {
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this.ctx = uni.createCameraContext()
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console.log('摄像头上下文:', this.ctx ? '已获取' : '获取失败')
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} catch (e) {
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console.error('createCameraContext异常:', e)
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}
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// 若未就绪，每1秒重试，最多5秒
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if (!this.ctx) {
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var count = 0
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var timer = setInterval(() => {
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count++
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try {
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this.ctx = uni.createCameraContext()
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if (this.ctx) {
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console.log('摄像头上下文获取成功')
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clearInterval(timer)
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}
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} catch (e) {}
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if (count >= 5) {
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clearInterval(timer)
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console.log('摄像头上下文获取超时')
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setTimeout(function() {
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var video = document.getElementById('ccVideo')
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if (!video) {
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that.hintText = '视频组件加载失败'
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return
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}
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}, 1000)
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navigator.mediaDevices.getUserMedia({ video: { facingMode: 'environment', width: 1280, height: 720 } })
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.then(function(stream) {
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that.mediaStream = stream
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video.srcObject = stream
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video.play()
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that.ctxReady = true
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that.hintText = ''
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console.log('摄像头已就绪(WebRTC)')
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})
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.catch(function(err) {
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console.error('getUserMedia失败:', err)
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that.hintText = '摄像头访问被拒绝: ' + (err.message || '')
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})
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}, 500)
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} catch (e) {
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console.error('摄像头启动异常:', e)
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this.hintText = '摄像头启动异常'
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}
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},
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onCameraError(e) {
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console.error('摄像头错误:', e)
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uni.showToast({ title: '摄像头启动失败: ' + (e.detail || ''), icon: 'none' })
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stopCamera() {
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if (this.mediaStream) {
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var tracks = this.mediaStream.getTracks()
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for (var i = 0; i < tracks.length; i++) {
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tracks[i].stop()
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}
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this.mediaStream = null
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}
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},
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capturePhoto() {
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if (this.capturedList.length >= 9) {
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uni.showToast({ title: '最多拍9张', icon: 'none' })
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return
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}
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if (!this.ctx) {
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// 尝试重新获取
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try {
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this.ctx = uni.createCameraContext()
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} catch (e) {}
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}
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if (!this.ctx) {
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uni.showToast({ title: '摄像头未就绪', icon: 'none' })
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// 用 canvas 截取 video 帧
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var video = document.getElementById('ccVideo')
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var canvas = document.getElementById('ccCanvas')
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if (!video || !canvas) {
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uni.showToast({ title: '拍照失败', icon: 'none' })
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return
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}
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uni.showLoading({ title: '拍照中...', mask: true })
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this.ctx.takePhoto({
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quality: 'high',
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success: (res) => {
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uni.hideLoading()
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this.capturedList.push(res.tempImagePath)
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},
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fail: (err) => {
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uni.hideLoading()
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console.error('拍照失败:', err)
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uni.showToast({ title: '拍照失败', icon: 'none' })
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canvas.width = video.videoWidth || 1280
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canvas.height = video.videoHeight || 720
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var ctx = canvas.getContext('2d')
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ctx.drawImage(video, 0, 0, canvas.width, canvas.height)
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// 转 blob 后生成本地临时文件路径
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var that = this
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canvas.toBlob(function(blob) {
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if (!blob) {
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// fallback: data url
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var dataUrl = canvas.toDataURL('image/jpeg', 0.85)
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that.capturedList.push(dataUrl)
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return
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}
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})
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// 用 FileReader 读 blob 为 dataUrl，走 uni.saveFile
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var reader = new FileReader()
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reader.onloadend = function() {
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var base64 = reader.result
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if (base64) {
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// 直接存 base64 data url
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that.capturedList.push(base64)
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}
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}
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reader.readAsDataURL(blob)
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}, 'image/jpeg', 0.85)
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},
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deletePhoto(idx) {
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this.capturedList.splice(idx, 1)
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@ -111,6 +136,8 @@
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uni.showToast({ title: '请先拍照', icon: 'none' })
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return
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}
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// 停止摄像头
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this.stopCamera()
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var pages = getCurrentPages()
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var prevPage = pages[pages.length - 2]
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if (prevPage) {
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@ -136,9 +163,30 @@
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overflow: hidden;
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background: #111;
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}
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.cc-camera {
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.cc-video {
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width: 100%;
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height: 100%;
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object-fit: cover;
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}
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.cc-canvas {
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display: none;
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}
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.cc-camera-hint {
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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background: #111;
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padding: 40rpx;
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}
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.cc-hint-text {
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color: #999;
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font-size: 28rpx;
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text-align: center;
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}
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.cc-thumb-bar {
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background: #1a1a1a;
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