小程序开发放大淡出的麦克风动画效果代码

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;  
}

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