微信小程序使用swiper切换tab选项卡

首先效果如下，通过手动点击上方3个tab选项卡也可切换内容，直接滑动也可实现切换内容

image.png

---

我们要将上方的三个选项卡先写出来

<!--Tab布局-->
<view class='title'>
  <view class="{{0 == currentIndex ? 'title-sel-selected' : 'title-sel'}}" bindtap='titleClick' data-idx='0'>
    <text>关注</text>
    <hr class="line-style" />
  </view>
  <view class="{{1 == currentIndex ? 'title-sel-selected' : 'title-sel'}}" bindtap='titleClick' data-idx='1'>
    <text>推荐</text>
    <hr class="line-style" />
  </view>
  <view class="{{2 == currentIndex ? 'title-sel-selected' : 'title-sel'}}" bindtap='titleClick' data-idx='2'>
    <text>资讯</text>
    <hr class="line-style" />
  </view>
</view>

---

滑动切换tab需要用到swiper来实现，其中swiper和swiper-item则都需要设置长度为100%，然后父组件通过Js方法设置自适应长度，其中recommend是我引入的自定义子组件。

<!--滑动切换 tab-->
<view style="height:{{ch}}rpx;">
  <swiper bindchange='swiperTab' current='{{currentIndex}}' class="swiper">

    <swiper-item>
      <scroll-view class="scroll" scroll-y wx:if="{{currentIndex == 0}}">
        <text>你好</text>
      </scroll-view>
    </swiper-item>

    <swiper-item>
      <scroll-view class="scroll" scroll-y wx:if="{{currentIndex == 1}}">
        <recommend/>
      </scroll-view>
    </swiper-item>

    <swiper-item>
      <scroll-view class="scroll" scroll-y wx:if="{{currentIndex == 2}}">
        <view class="tip">第3个tab</view>
      </scroll-view>
    </swiper-item>
  </swiper>
</view>

---

js方法

// pages/mine/mine.js
Page({

  /**
   * 页面的初始数据
   */
  data: {
    currentIndex: 1,
    ch: 0,
  },

  onLoad: function (options) {
    wx.getSystemInfo({
      success: res => {
        //转为rpx
        let ch = (750 / res.screenWidth) * res.windowHeight - 80;
        this.setData({
          ch
        })
      },
    })
  },

  //用户点击tab时调用
  titleClick: function (e) {
    let currentPageIndex =
      this.setData({
        //拿到当前索引并动态改变
        currentIndex: e.currentTarget.dataset.idx
      })
  },

  //用户滑动切换tab调用
  swiperTab: function (e) {
    if (e.detail.source == 'touch') {
      this.setData({
        currentIndex: e.detail.current
      });
    }
  },
})

---

wxss样式

 
.title {
  width: 100%;
  height: 88rpx;
  background: white;
  display: flex;
  align-items: center;
  justify-content: space-around;
}
 
.title-sel {
  color: #24272c;
  font-size: 32rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}
 
.title-sel  .line-style{
  background: #fff;
  height: 6rpx;
  width: 40rpx;
  position: relative;
  margin-top: 10rpx;
}
 
.title-sel-selected{
  color: #006bff;
  font-size: 32rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.title-sel-selected .line-style{
  background: #006bff;
  height: 6rpx;
  width: 90rpx;
  position: relative;
  margin-top: 10rpx;
}
.swiper,.scroll{
  height: 100%;
}