微信小程序开发之麦克风动画 帧动画 放大 淡出

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

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