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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