微信小程序 旋转图片Animation

Posted 2022-05-30 zhangzheng022

最近制作TODO小程序想旋转图片来达到一秒走一下

首先在wxml定义一个图形

<view class="container">
  <view class="page-body">
    <view class="page-section">
      <view class="animation-element-wrapper">
        <view class="animation-element" animation="animation"></view>
      </view>
      <view class="animation-buttons" scroll-y="true">
        <button class="animation-button" bindtap="startAnimationInterval">旋转</button>
        <button class="animation-button" bindtap="stopAnimationInterval">暂停</button>
        <button class="animation-button" bingtap=""></button>
        <button class="animation-button animation-button-reset" bindtap="reset">还原</button>
      </view>
    </view>
  </view>
</view>

animation是在js定义的data

data: 
    animation: ''
  

相关js代码

var _animation; // 动画实体
var _animationIndex = 0; // 动画执行次数index（当前执行了多少次）
var _animationIntervalId = -1; // 动画定时任务id，通过setInterval来达到无限旋转，记录id，用于结束定时任务
const _ANIMATION_TIME = 60; // 动画播放一次的时长ms
Page(
  data: 
    animation: ''
  ,
  onReady: function () 
    _animationIndex = 0;
    _animationIntervalId = -1;
    this.data.animation = '';
  ,

  onShow: function () 
    _animation = wx.createAnimation(
      duration: _ANIMATION_TIME,
      timingFunction: 'linear', // "linear","ease","ease-in","ease-in-out","ease-out","step-start","step-end"
      delay: 0,
      transformOrigin: '50% 50% 0'
    )
  ,

  /**
   * 实现image旋转动画，每次旋转 1 * n度
   */
  rotateAni: function (n) 
    _animation.rotate(1 * (n)).step()
    this.setData(
      animation: _animation.export()
    )
  ,

  /**
   * 开始旋转
   */
  startAnimationInterval: function () 
    var that = this;
    that.rotateAni(++_animationIndex); // 进行一次旋转
    _animationIntervalId = setInterval(function () 
      that.rotateAni(++_animationIndex);
    , _ANIMATION_TIME); // 每间隔_ANIMATION_TIME进行一次旋转
  ,

  /**
   * 停止旋转
   */
  stopAnimationInterval: function () 
    if (_animationIntervalId > 0) 
      clearInterval(_animationIntervalId);
      _animationIntervalId = 0;
    
  ,
)

css

.animation-element-wrapper 
  display: flex;
  width: 100%;
  padding-top: 150rpx;
  padding-bottom: 150rpx;
  justify-content: center;
  overflow: hidden;
  background-color: #ffffff;

.animation-element 
  width: 200rpx;
  height: 200rpx;
  background-color: #1AAD19;

.animation-buttons 
  padding: 30rpx 50rpx 10rpx;
  width: 100%;
  height: 700rpx;
  box-sizing: border-box;

.animation-button 
  float: left;
  line-height: 2;
  width: 300rpx;
  margin: 15rpx 12rpx;


.animation-button-reset 
  width: 620rpx;