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微信小程序 — 实现轮播视图

2021-05-17

4,749 评论

一般在商城类型的APP上会有一个推荐维，展示几个主打的内容或商品，上面就循环轮播的展示几个图片。在微信小程序中，直接提供了一个swiper节点能够轻松愉快的实现这样的效果。

首先，我们需要几张图片。然后定义这个轮播视图的区域大小 ，首先我们通过wxss定义容器样式：

.ad_swiper_container {
  width: 100%;
  height: 150px;
  margin-top: 10px;
}

.ad_swiper_image {
  height:150px;
  width: 100%;
}

这里我我们定义了2个样式，一个是控制视图大小和偏移位置的。一个是里面图片的显示样式。接下来在wxml中书写效果。

<view class="ad_swiper_container">
  <swiper indicator-dots="true" autoplay="true" circular="true" indicator-color="#fff" indicator-active-color="#f77770">
    <block wx:for="{{array}}" wx:key="*this">
      <swiper-item style="background-color:#000;">
      <image src="{{item.url}}" class="ad_swiper_image" mode="widthFix"></image>
    </swiper-item>
    </block>
  </swiper>
</view>

swiper:是整个滑动视图的节点，它需要配合swiper-item节点使用。

swiper-item:代表里面具体的单个项，如果我们有2张图片，这里就有2个swiper-item节点。

这里我们通过js来控制图片的动态设置，我们在js文件中的data结构中定义一个代表图片地址的数组：

 data: {
    array:[{
      url:"/res/swiper_1.jpg"
    },{
      url:"/res/swiper_2.jpg"
    }]
  },

然后通过wx:for循环语法，在wxml中动态的创建swiper-item节点。上面的block节点相当于是个空节点，不会有任何视图效果，这里仅仅起到写wx:for这种动态代码的作用。在swiper-item中嵌入具体的内容即可，我们这里是图片，所以就单独嵌入一个image节点。

swiper上可以设置一些样式，比如是否显示当前展示的item的小圆点，圆点选中和非选中的颜色，是否循环显示，显示时长等等。

我这里不一一展示了，在微信小程序的官方文档上，对这些属性变量进行了说明，能够很方便的使用：

https://developers.weixin.qq.com/miniprogram/dev/component/swiper.html

微信小程序

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