WeChat applet development and production of microphone animation to achieve amplification and fade-out effects

This article mainly introduces the microphone animation developed by WeChat applet: frame animation, amplification, and fade-out related information. Has very good reference value. Let’s take a look at it with the editor.

I want to make a voice recorder, but the first step is stuck in the microphone animation.

First upload the gif. Then complain.

① The animation of the sound wave in the gif above is a semi-finished product. There is no loop playback. I searched for a long time in the development documentation of the WeChat applet and could not find the parameter settings for the loop mode. Use setInterval( ) does not execute animation. I found such a line at the bottom of WeChat applet document animation. Can this pot be thrown away?

ps: If any students can realize animation loop, please tell me.

##② There is a frame animation in the microphone. There is no front-end foundation. We can only make do with non-mainstream methods.

Use wx:if{{}} to determine whether the value defined in js is equal to the number corresponding to the picture to control the display and hiding of the picture. There should be a better method in .css. My CSS foundation is not strong, so I won’t go into details.

The above code:

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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