小程序横向滚动公告栏的实现方法

效果图

//wxml

<view class='notice'>
  <view class="left">
    <text class='iconfont icon-labagonggao voice'></text>
      <view class="left-box">
        <view class="left-text"></view>
        <view class='content-box'>
          <view class='content-text' animation="{{animationData}}"><text id="text">{{text}}</text></view>
        </view>
        <view class="right-text"></view>
      </view>
  </view>
  <view class="right" bindtap="goApp">
    <!-- <image class="app" mode="aspectFit" src="/assets/images/app.png" style="width:{{widthrpx}}rpx" bindload="imageLoad"></image> -->
    <text class="more">更多应用></text>
  </view>
</view>

// wxss

.notice {
  display: flex;
  align-content: center;
  justify-content: space-between;
  padding: 10rpx 25rpx;
  background: #f1f1f1;
}

.left {
  display: flex;
  align-items: center;
}

.voice {
  margin-right: 5rpx;
  margin-top: 2rpx;
  color: #fa6016;
}

.left-box {
  position: relative;
  display: flex;
  align-items: center;
}

.left-text {
  position: absolute;
  left: 0;
  width: 40rpx;
  height: 100%;
  background: linear-gradient(to left,rgba(241,241,241,0),rgba(241,241,241,1));
  z-index: 99;
}

.right-text {
  position: absolute;
  right: -1rpx;
  width: 40rpx;
  height: 100%;
  background: linear-gradient(to left,rgba(241,241,241,1),rgba(241,241,241,0));
  z-index: 99;
}

.content-box {
  overflow: hidden;
  width: 350rpx;
}

.content-text {
  color: #5e5e5e;
  white-space: nowrap;
  font-size: 28rpx;
}

.right {
  display: flex;
  align-items: center;
}

.app {
  height: 48rpx;
}

.more {
  margin-left: 5rpx;
  color: #aaa;
  font-size: 32rpx;
}

// js

  data: {
    text: "1.【评分标准】页可以查看不同年龄段的评分标准，通过首页选择对应的性别、类别和年龄。2.【单项成绩】页包含了详细的单项打分情况及成绩雷达图，直观地看出自己的弱项和强项。",
    animation: null,
    timer: null,
    duration: 0,
    textWidth: 0,
    wrapWidth: 0
  },
  onShow() {
    this.initAnimation(this.data.text)
  },
  onHide() {
    this.destroyTimer()
    this.setData({
      timer: null
    })
  },
  onUnload() {
    this.destroyTimer()
    this.setData({
      timer: null
    })
  },
destroyTimer() {
    if (this.data.timer) {
      clearTimeout(this.data.timer);
    }
  },
  /**
   * 开启公告字幕滚动动画
   * @param  {String} text 公告内容
   * @return {[type]} 
   */
  initAnimation(text) {
    let that = this
    this.data.duration = 15000
    this.data.animation = wx.createAnimation({
      duration: this.data.duration,
      timingFunction: 'linear'   
    })
    let query = wx.createSelectorQuery()
    query.select('.content-box').boundingClientRect()
    query.select('#text').boundingClientRect()
    query.exec((rect) => {
      that.setData({
        wrapWidth: rect[0].width,
        textWidth: rect[1].width
      }, () => {
        this.startAnimation()
      })
    })
  },
  // 定时器动画
  startAnimation() {
    //reset
    // this.data.animation.option.transition.duration = 0
    const resetAnimation = this.data.animation.translateX(this.data.wrapWidth).step({ duration: 0 })
    this.setData({
      animationData: resetAnimation.export()
    })
    // this.data.animation.option.transition.duration = this.data.duration
    const animationData = this.data.animation.translateX(-this.data.textWidth).step({ duration: this.data.duration })
    setTimeout(() => {
      this.setData({
        animationData: animationData.export()
      })
    }, 100)
    const timer = setTimeout(() => {
      this.startAnimation()
    }, this.data.duration)
    this.setData({
      timer
    })
  },