微信小程序开发之麦克风动画 帧动画 放大 淡出

Posted 2020-08-21 dzp_coder

想做个录音机,第一步就卡在麦克风动画这里了.

先上gif.再吐槽.

① 上面gif中声波的动画是个半成品.没有循环播放.在微信小程序的开发文档上找了很久,也没找到循环模式的参数设置.用setInterval()并不执行动画.我在 微信小程序文档 动画最下面找到这么一行字.这个锅是不是可以甩出去了?

ps:如果有同学能实现动画循环,一定告诉我.

② 麦克风里面是个帧动画.没有前端的基础,只能用非主流的办法凑合了.

用wx:if{{}}判断js中定义的值是不是等于图片对应的数字来控制图片的显示和隐藏.css中应该有更好的方法.我css基础不牢,就不说了.

上代码:

1.index.wxml

<!--index.wxml-->
<view  class="voice-style" bindtap="startSpeak">
<image class="bg-style" src="../../images/voice_icon_speaking_bg_normal.png" ></image>
<image class="bg-style" animation="{{spreakingAnimation}}" src="../../images/voice_video_loading_0.png"></image>
<image class="bg-style" animation="{{spreakingAnimation_1}}" src="../../images/voice_video_loading_0.png"></image>
<image class="bg-style" animation="{{spreakingAnimation_2}}" src="../../images/voice_video_loading_0.png"></image>
<image class="sound-style" src="../../images/voice_icon_speech_sound_1.png" ></image>
<image wx:if="{{j==2}}" class="sound-style" src="../../images/voice_icon_speech_sound_2.png" ></image>
<image wx:if="{{j==3}}" class="sound-style" src="../../images/voice_icon_speech_sound_3.png" ></image>
<image wx:if="{{j==4}}" class="sound-style" src="../../images/voice_icon_speech_sound_4.png" ></image>
<image wx:if="{{j==5}}"class="sound-style" src="../../images/voice_icon_speech_sound_5.png" ></image>
</view>

2.index.js

//index.js
//获取应用实例
var app = getApp()
Page({
  data: {
    spreakingAnimation: {},//放大动画
    j: 1,//帧动画初始图片
    isSpeaking: false,//是否在录音状态
  },
  onLoad: function () {
  },
  //点击开始说话
  startSpeak: function () {
    var _this = this;
    if (!this.data.isSpeaking) {
      speaking.call(this);
      this.setData({
        isSpeaking: true
      })
    } else {
      //去除帧动画循环
      clearInterval(this.timer)
      this.setData({
        isSpeaking: false,
        j: 1
      })
    }
  },
})


function speaking() {
  //话筒帧动画
  var i = 1;
  this.timer = setInterval(function () {
    i++;
    i = i % 5;
    _this.setData({
      j: i
    })
    return
  }, 200);
  //波纹放大,淡出动画
  var _this = this;
  var animation = wx.createAnimation({
    duration: 1000
  })
  animation.opacity(0).scale(3, 3).step();//修改透明度,放大
  this.setData({
    spreakingAnimation: animation.export()
  })
 setTimeout(function(){
    //波纹放大,淡出动画
  var animation = wx.createAnimation({
    duration: 1000
  })
  animation.opacity(0).scale(3, 3).step();//修改透明度,放大
  _this.setData({
    spreakingAnimation_1: animation.export()
  })
  },250)
   setTimeout(function(){
    //波纹放大,淡出动画
  var animation = wx.createAnimation({
    duration: 1000
  })
  animation.opacity(0).scale(3, 3).step();//修改透明度,放大
  _this.setData({
    spreakingAnimation_2: animation.export()
  })
  },500)
}

3.index.wxss

/**index.wxss**/
.voice-style {
  margin-top: 400px;
  display: flex;
  position: relative;
  flex-direction: column;
  align-items: center;
}

.bg-style {
  position: absolute;
  width: 100px;
  height: 100px;
}
.sound-style{
  position: absolute;
  width: 37.6px;
  height: 60px;
  margin-top: 20px;
}

demo代码下载

我的博客:http://blog.csdn.net/qq_31383345

欢迎批评!