swiper组件添加左右箭头

前言：小程序官方swiper组件并未提供带左右箭头功能，但有些时候还是想把左右箭头添加上，今天连胜老师就给大家分享一下自己的实现方式。

思路很简单：在swiper组件内部添加两个image组件，绑定点击事件，动态改变swiper中的current值。不废话，主要看代码：

WXML:

<swiper indicator-dots="{{swiper.indicatorDots}}"
  autoplay="{{swiper.autoplay}}" interval="{{swiper.interval}}" duration="{{swiper.duration}}" current='{{swiper.current}}' circular="true">
  <block wx:for="{{swiper.imgUrls}}">
    <swiper-item>
      <image src="{{item}}" class="slide-image" width="355" height="150"/>
    </swiper-item>
  </block>
  <image class='prev arrow' bindtap='prevImg' src='/images/prev.jpg' />
  <image class='next arrow' bindtap='nextImg' src='/images/next.jpg' />
</swiper>

WXSS:

swiper{
  position: relative;
  height: 300rpx;
}
swiper image{
  display: block;
  width: 100%;
  height: 300rpx;
  cursor: pointer;
}

swiper .arrow{
  width: 30rpx;
  height: 46rpx;
}

swiper .prev{
  position: absolute;
  left: 0;
  top: 50%;
  transform: translate(0, -50%);
  cursor: pointer;
}

swiper .next{
  position: absolute;
  right: 0;
  top: 50%;
  transform: translate(0, -50%);
}

JS:

//index.js
Page({
  data: {
    swiper: {
      imgUrls: [
        '/images/swiper01.jpg',
        '/images/swiper02.jpg',
        '/images/swiper03.jpg'
      ],
      indicatorDots: true,
      autoplay: false,
      interval: 5000,
      duration: 1000,
      current: 0,
    }
  },
  prevImg: function(){
    var swiper = this.data.swiper;
    var current = swiper.current;
    swiper.current = current>0 ? current-1 : swiper.imgUrls.length-1;
    this.setData({
      swiper: swiper,
    })
  },
  nextImg: function () {
    var swiper = this.data.swiper;
    var current = swiper.current;
    swiper.current = current < (swiper.imgUrls.length - 1) ? current + 1 : 0;
    this.setData({
      swiper: swiper,
    })
  }
})

看一下完成之后的效果：

貌似还不错，有用到这功能的同学，直接copy代码运行即可~