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小程序开发实例技巧(二)横向滑动切换列表效果

2019-01-14  本文已影响10人  菜菜___

在项目开发中,我们经常会对数据进行分组并且循环加载,像今日头条app首页那样,今天动手写了个类似的demo,效果图如下:



主要涉及到:

scroll-view可滚动视图区域组件,swiper滑块视图容器,以及for循环列表数据。

第一步:打开微信开发者工具,新建一个小程序项目,或者直接在已有的小程序项目里新建一个test文件夹,文件夹目录如下:


test.wxml代码:

<view>
  <scroll-view scroll-x="true" class="tab-h" scroll-left="{{scrollLeft}}">
    <block wx:for-items="{{newsTab}}">
      <view data-current="{{index}}" class="tab-item {{currentTab == index ?'active':''}}" bindtap="swichNav" >
        {{item}}
      </view>
    </block>
  </scroll-view>
  <swiper class="tab-content" current="{{currentTab}}" duration="300" bindchange="switchTab" style="height:{{winHeight}}rpx">
    <swiper-item wx:for="{{[0,1,2,3,4,5,6,7]}}">
      <scroll-view scroll-y="true" class="scoll-h">
        <block wx:for="{{[0,1,2,3,4,5,6,7,8]}}" wx:key="*this">
          <view class="item">
            <view class="img">
              <image src="{{authorList.img}}"></image>
            </view>
            <view class="author-info">
              <view class="name">{{authorList.name}}</view>
              <view class="tag">{{authorList.tag}}</view>
              <view class="answerHistory">{{authorList.answer}}个回答,{{authorList.listen}}人听过 </view>
            </view>
            <navigator url="" class="shouting">关注</navigator>
          </view>
        </block>
      </scroll-view>
    </swiper-item>
  </swiper>
</view>

test.js代码:

var app = getApp();
Page({
  data: {
    winHeight: "",//窗口高度
    currentTab: 0, //预设默认选中的栏目
    scrollLeft: 0, //tab滚动条距离左侧距离
    newsTab: ["健康", "情感", "职场", "育儿", "文学","青葱","科技","达人"],
    authorList: {
      img: "http://ookzqad11.bkt.clouddn.com/avatar.png",
      name: "欢顔",
      tag: "知名情感博主",
      answer: 134,
      listen: 2234
    }
  },
  // 滚动切换标签样式
  switchTab: function (e) {
    this.setData({
      currentTab: e.detail.current
    });
    this.checkCor();
  },
  // 点击tab切换当前页时改变样式
  swichNav: function (e) {
    var cur = e.target.dataset.current;
    if (this.data.currentTab == cur) {
      return false;
    }
    else {
      this.setData({
        currentTab: cur
      })
    }
  },
  //判断当前滚动超过一屏时,设置tab向左滚动。
  checkCor: function () {
    if (this.data.currentTab > 4) {
      this.setData({
        scrollLeft: 300
      })
    } else {
      this.setData({
        scrollLeft: 0
      })
    }
  },
  onLoad: function () {
    var that = this;
    //  高度自适应
    wx.getSystemInfo({
      success: function (res) {
        var clientHeight = res.windowHeight,
          clientWidth = res.windowWidth,
          rpxR = 750 / clientWidth;
        var calc = clientHeight * rpxR - 180;
        that.setData({
          winHeight: calc
        });
      }
    });
  }
})

test.wxss代码:

.tab-h {
  height: 100rpx;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  line-height: 80rpx;
  background: #f7f7f7;
  font-size: 16px;
  white-space: nowrap;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 99;
}
.tab-item {
  margin: 0 36rpx;
  display: inline-block;
}
.tab-item.active {
  color: #4675f9;
  position: relative;
}
.tab-item.active:after {
  content: "";
  display: block;
  height: 8rpx;
  width: 66rpx;
  background: #4675f9;
  position: absolute;
  bottom: 0;
  left: 5rpx;
  border-radius: 16rpx;
}
.tab-content {
  margin-top: 100rpx;
}
.tab-content .author-info{
  font-size: 12px;
  flex-grow: 3;
  color: #b0b0b0;
  line-height: 1.5em;
}
.tab-content .author-info .name {
  font-size: 16px;
  color: #000;
  margin-bottom: 6px;
}
.item {
  display: flex;
  width: 100%;
  padding: 30rpx;
  justify-content: space-between;
  align-items: center;
  box-sizing: border-box;
  border-bottom: 1px solid #f2f2f2;
}
.img {
  width: 100rpx;
  height: 100rpx;
  position: relative;
  padding-right: 30rpx;
}
.img image {
  width: 100%;
  height: 100%;
}
.shouting {
  width: 120rpx;
  height: 60rpx;
  line-height: 60rpx;
  text-align: center;
  font-size: 14px;
  border-radius: 60rpx;
  border: 1px solid #4675f9;
  color: #4675f9;
}
.scoll-h {
  height: 100%;
}

原文作者技术博客:https://www.jianshu.com/u/ac4daaeecdfe
95后前端妹子一枚,爱阅读,爱交友,将工作中遇到的问题记录在这里,希望给每一个看到的你能带来一点帮助。
欢迎留言交流。

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