微信小程序实现拆红包动画_小程序 打开红包的动画

1.实现效果

2.实现原理

wx.createAnimation(Object object)：创建一个动画实例 animation。调用实例的方法来描述动画。最后通过动画实例的 export 方法导出动画数据传递给组件的 animation 属性。

• 点击红包，弹出红包弹框，用到过渡动画

this.animation.translate('-50%', '-50%').step();
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• 关闭弹框

this.animation.translate('-50%', '100%').step();
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• 将红包弹框拆分成两部分，后续点击开红包时候的上下两部分反向淡出动画

   animation1.translateY('-350%').step();
   animation2.translateY('300%').step()
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• 当开红包动画结束，关闭弹框，并清除动画，这里用opacity来清除动画（一般情况按照原来的样式复原即可，因为该处原本无transfrom属性，还原动画若添加transfrom会影响页面布局，即用opacity）

 animation1.opacity(1).step();
 animation2.opacity(1).step();
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• 上下两部分的圆弧用伪元素+border-radius+box-shadow实现
• 点击开红包，添加动画

@keyframes rotate {
  0% {
    transform: rotateY(0deg);
  }

  100% {
    transform: rotateY(360deg);
  }
}
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3.实现代码

<view class="flex">
  <image src="https://i.postimg.cc/mgsKJGLw/susu1.jpg" class="user_avatar" />
  <view class="wallet_box" catchtap="show">
    <view class="flex-row j_c">
      <image src="../img/red.png" class="red_icon" />
      <view>恭喜发财，大吉大利</view>
    </view>
    <view class="wallet_tip">微信红包</view>
  </view>
</view>
<!-- 红包弹框 -->
<view class="mask" hidden="{{!show}}"></view>
<view class="red_box flex-column" animation="{{animationData}}" hidden="{{!show}}">
  <view class="top flex-column" animation="{{animationData1}}">
    <view class="flex-row">
      <image src="https://i.postimg.cc/mgsKJGLw/susu1.jpg" class="user_avatar_dia" />
      <view>小苏苏的红包</view>
    </view>
    <view class="text">恭喜发财，大吉大利</view>
    <view class="top_radius">
      <view class="open" catchtap="open" wx:if="{{not_open}}">開</view>
      <view wx:else class="anim-rotate">
        <view class="roate_box" style="transform: translateZ(-3px);">開</view>
        <view class="roate_box roate_box_center" wx:for="{{5}}" wx:key="index" style="transform:translateZ({{index-3}}px)"></view>
        <view class="roate_box roate_box_center" style="transform: translateZ(3px);">開</view>
      </view>
    </view>
  </view>
  <view class="bottom" animation="{{animationData2}}">
    <view class="line"></view>
    <view class="bottom_box"></view>
  </view>
  <image src="/img/close_icon.png" class="close_icon" catchtap="closeModal" />
</view>
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/* pages/effects/clipRed/index.wxss */
page {
  padding: 20rpx;
  box-sizing: border-box;
  background-color: #fff;
}

.user_avatar {
  width: 60rpx;
  height: 60rpx;
  border-radius: 10rpx;
  flex-shrink: 0;
  margin-right: 30rpx;
}

.wallet_box {
  position: relative;
  width: 360rpx;
  height: 140rpx;
  border-radius: 10rpx;
  background-color: orange;
  box-sizing: border-box;
  padding: 10rpx 21rpx;
  color: #fff;
  font-size: 25rpx;
}

.red_icon {
  width: 70rpx;
  height: 70rpx;
  flex-shrink: 0;
  margin-right: 10rpx;
}

.wallet_box::after {
  content: '';
  position: absolute;
  top: 20rpx;
  left: -15rpx;
  width: 0;
  height: 0;
  border-top: 20rpx solid transparent;
  border-bottom: 20rpx solid transparent;
  border-right: 20rpx solid orange;
}

.wallet_tip {
  border-top: 1rpx solid rgb(255, 255, 255, .2);
  margin-top: 10rpx;
  padding-top: 10rpx;
  font-size: 20rpx;
}

.red_box {
  position: fixed;
  left: 50%;
  transform: translate(-50%, 100%);
  top: 50%;
  color: rgb(235, 205, 153);
  width: 530rpx;
  z-index: 1222;
  font-size: 27rpx;
}

.top {
  position: relative;
  border-radius: 15rpx 15rpx 0 0;
  width: 100%;
  padding: 175rpx 0 0rpx;
  box-sizing: border-box;
  background-color: #f45e4d;
}

.top_radius {
  width: 100%;
  height: 100px;
  position: relative;
}

.top_radius::after {
  width: 100%;
  height: 100px;
  position: absolute;
  left: 0;
  top: 52px;
  content: '';
  border-radius: 50%;
  z-index: 10;
  background-color: rgb(244, 94, 77);
  box-shadow: 0 3px 3px 0 rgb(0 0 0 / 10%);
}

.close_icon {
  position: absolute;
  width: 50rpx;
  height: 50rpx;
  bottom: -91rpx;
}

.user_avatar_dia {
  margin-right: 10rpx;
  width: 40rpx;
  height: 40rpx;
  border-radius: 8rpx;
  flex-shrink: 0;
}

.text {
  font-size: 36rpx;
  margin-top: 20rpx;
}

.bottom {
  overflow: hidden;
  width: 100%;
  margin-top: -70rpx;
}

.bottom_box {
  margin-top: 70rpx;
  height: 240rpx;
  background-color: rgb(242 85 66);
  border-radius: 0 0 15rpx 15rpx;
}

.line {
  width: 100%;
  position: relative;
}

.line::after {
  width: 120%;
  height: 140rpx;
  position: absolute;
  left: -10%;
  top: -70rpx;
  z-index: -1;
  content: '';
  border-radius: 50%;
  box-shadow: 0 30px 0 0 rgb(242 85 66);
}

.open {
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  position: absolute;
  left: 50%;
  z-index: 99;
  bottom: -161rpx;
  border-radius: 50%;
  width: 130rpx;
  height: 130rpx;
  line-height: 130rpx;
  font-size: 45rpx;
  text-align: center;
  color: #333;
  font-weight: bold;
  background-color: rgb(235, 205, 153);
  box-shadow: 0 0 3rpx 0 rgb(0 0 0 / 10%);
}

.roate_box {
  border-radius: 50%;
  width: 130rpx;
  height: 130rpx;
  line-height: 130rpx;
  font-size: 45rpx;
  text-align: center;
  color: #333;
  font-weight: bold;
  background-color: rgb(235, 205, 153);
  box-shadow: 0 0 3rpx 0 rgb(0 0 0 / 10%);
}

.anim-rotate {
  margin-left: -75rpx;
  transform-style: preserve-3d;
  animation: rotate 1s linear infinite;
  position: absolute;
  left: 50%;
  z-index:90;
  bottom: -161rpx;
}

@keyframes rotate {
  0% {
    transform: rotateY(0deg);
  }

  100% {
    transform: rotateY(360deg);
  }
}

.roate_box_center {
  position: absolute;
  top: 0;
  z-index: 99;
}
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Page({
  data: {
    show: false,
    not_open: true,
    animationData: {},
    animationData1: {},
    animationData2: {},
  },
  closeModal() {
    this.slideIn(1);
    setTimeout(() => {
      this.setData({
        show: false
      })
    }, 200);
  },
  show() {
    wx.showLoading({
      title: '加载中...',
      mask: true
    })
    setTimeout(() => {
      this.setData({
        show: true
      }, (() => {
        this.slideIn(0)
      }))
      wx.hideLoading();
    }, 500);
  },
  open() {
    this.setData({
      not_open: false
    }, (() => {
      setTimeout(() => {
        this.setData({
          not_open: true,
        })
        this.fadeOut(() => {
          let animation = wx.createAnimation({
            duration: 0,
            timingFunction: 'step-end'
          })
          let animation1 = wx.createAnimation({
            duration: 0,
            timingFunction: 'step-end'
          })
          animation.opacity(1).step();
          animation1.opacity(1).step();
          this.setData({
            show: false,
            animationData1: animation.export(),
            animationData2: animation1.export(),
          })
        })
      }, 1000);
    }))
  },

  ....
})
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4.完整代码，关注公众号 苏苏的bug，更多小程序demo，尽在苏苏的码云如果对你有帮助，欢迎你的star+订阅！