详解uni-app（vue）基于InnerAudioContext封装一个基本的音频组件

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原由

同样的是因为小程序官方不维护audio组件了

音频组件的要求与限制

1、点击播放或者暂停
2、显示播放进度及总时长
3、通过图标变化显示当前音频所处状态（暂停/播放/加载中）
4、页面音频更新时刷新组件状态
5、全局有且只有一个音频处于播放状态
6、离开页面之后要自动停止播放并销毁音频实例

材料/属性/方法

让我们开始吧

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uni-app Vue

• 同样的先构造DOM结构

<view class="custom-audio">
  <image v-if="audioSrc !== undefined && audioSrc !== null && audioSrc !== ''" @click="playOrStopAudio" :src="audioImg" class="audio-btn" />
  <text v-else @click="tips" class="audio-btn">无音源</text>
  <text>{{ fmtSecond(currentTime) }}/{{ fmtSecond(duration) }}</text></view>复制代码

• 定义接受的组件

props: {  audioSrc: {    type: String,    default: ''
  },
},复制代码

• 定义CustomAudio组件的初始化相关的操作，并给innerAudioContext的回调添加一些行为（之前Taro那篇我们踩过的坑这里就直接上代码了）

import { formatSecondToHHmmss, afterAudioPlay, beforeAudioRecordOrPlay } from '../../lib/Utils'const iconPaused = '../../static/images/icon_paused.png'const iconPlaying = '../../static/images/icon_playing.png'const iconStop = '../../static/images/icon_stop.png'const iconLoading = '../../static/images/icon_loading.gif'// ...data() {  return {    audioCtx: null, // 音频上下文
    duration: 0, // 音频总时长
    currentTime: 0, // 音频当前播放的时长
    audioImg: iconLoading, // 默认状态为加载中
  }
},watch: {  audioSrc: {
    handler(newSrc, oldSrc) {      console.log('watch', newSrc, oldSrc)      this.audioImg = iconLoading      this.currentTime = 0
      this.duration = 0
      if (this.audioCtx === undefined) {        this.audioCtx = uni.createInnerAudioContext()        this.onTimeUpdate = this.audioCtx.onTimeUpdate        this.bindAuidoCallback(this.audioCtx)
      } else {        this.audioCtx.src = newSrc
      }      if (this.audioCtx.play) {        this.audioCtx.stop()
        getApp().globalData.audioPlaying = false
      }
    }
  }
},
mounted() {  this.audioCtx = uni.createInnerAudioContext()  this.audioCtx.src = this.audioSrc  this.audioCtx.startTime = 0
  this.bindAuidoCallback(this.audioCtx)
},methods: {
  bindAuidoCallback(ctx) {
    ctx.onTimeUpdate((e) => {      this.onTimeUpdate(e)
    })
    ctx.onCanplay((e) => {      this.onCanplay(e)
    })
    ctx.onWaiting((e) => {      this.onWaiting(e)
    })
    ctx.onPlay((e) => {      this.onPlay(e)
    })
    ctx.onPause((e) => {      this.onPause(e)
    })
    ctx.onEnded((e) => {      this.onEnded(e)
    })
    ctx.onError((e) => {      this.onError(e)
    })
  },
  tips(){
    uni.showToast({      title: '无效音源,请先录音',      icon: 'none'
    })
  },
  playOrStopAudio() {    if (this.audioCtx === null) {      this.audioCtx = uni.createInnerAudioContext()      this.audioCtx.src = this.audioSrc      this.bindAuidoCallback(this.audioCtx)
    }    if (this.audioCtx.paused) {      if (beforeAudioRecordOrPlay('play')) {        this.audioCtx.play()        this.audioImg = iconPlaying
      }
    } else {      this.audioCtx.pause()
      afterAudioPlay()      this.audioImg = iconPaused
    }
  },
  onTimeUpdate(e) {    console.log('onTimeUpdate', this.audioCtx.duration, this.audioCtx.currentTime)    if (this.audioCtx.currentTime > 0 && this.audioCtx.currentTime <= 1) {      this.currentTime = 1
    } else if (this.currentTime !== Math.floor(this.audioCtx.currentTime)) {      this.currentTime = Math.floor(this.audioCtx.currentTime)
    }    const duration = Math.floor(this.audioCtx.duration)    if (this.duration !== duration) {      this.duration = duration
    }
  },
  onCanplay(e) {    if (this.audioImg === iconLoading) {      this.audioImg = iconPaused
    }    console.log('onCanplay', e)
  },
  onWaiting(e) {    if (this.audioImg !== iconLoading) {      this.audioImg = iconLoading
    }
  },
  onPlay(e) {    console.log('onPlay', e, this.audioCtx.duration)    this.audioImg = iconPlaying    if (this.audioCtx.duration > 0 && this.audioCtx.duration <= 1) {      this.duration = 1
    } else {      this.duration = Math.floor(this.audioCtx.duration)
    }
  },
  onPause(e) {    console.log('onPause', e)    this.audioImg = iconPaused
  },
  onEnded(e) {    console.log('onEnded', e)    if (this.audioImg !== iconPaused) {      this.audioImg = iconPaused
    }
    afterAudioPlay()
  },
  onError(e) {
    uni.showToast({      title: '音频加载失败',      icon: 'none'
    })    throw new Error(e.errMsg, e.errCode)
  },
  fmtSecond(sec) {    const { min, second } = formatSecondToHHmmss(sec)    return `${min}:${second}`
  }
},复制代码

同样的scss文件

<style lang="scss" scoped>.custom-audio {  border-radius: 8vw;  border: #CCC 1px solid;  background: #F3F6FC;  color: #333;  display: flex;  flex-flow: row nowrap;  align-items: center;  justify-content: space-between;  padding: 2vw;  font-size: 14px;
  .audio-btn {    width: 10vw;    height: 10vw;    white-space: nowrap;    display: flex;    align-items: center;    justify-content: center;
  }
}
</style>复制代码

最后

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