uni-app的下拉加载,实现谓微信聊天加载

uni-app实现微信聊天式下拉加载

最新推荐文章于 2024-10-26 18:06:57 发布

原创最新推荐文章于 2024-10-26 18:06:57 发布 · 1.1k 阅读

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本文介绍了如何在uni-app中实现类似微信聊天的下拉加载效果。通过监听屏幕距离顶部高度、滚动到特定位置以及获取内容高度，配合在page.json中设置`enablePullDownRefresh`: true，并处理App端的兼容问题，可以完成下拉刷新功能。

有下拉事件:

  onPullDownRefresh: function () {}

监听屏幕距离顶部高度

  onPageScroll(res) {
    console.log("高度", res.scrollTop); //距离页面顶部距离
  },

滚动到距离屏幕高度的距离

 uni.pageScrollTo({
            duration: 0, // 毫秒
            scrollTop: height, // 位置
  });

获取内容高度

  uni.getSystemInfo({
    success(res) {
      _this.phoneHeight = res.windowHeight;
      console.log(res.windowHeight);
      // 计算组件的高度
      let view = uni.createSelectorQuery().select(".i");//这标签是需要拿的标签
      view
        .boundingClientRect((data) => {
          _this.navHeight = data.height;
          _this.newh = data.height;
          _this.oldh = _this.newh;
          console.log(_this.oldh, _this.newh);
        })
        .exec();
    },
  });

然后直接上代码
需要在page.json设置下拉"enablePullDownRefresh":true

<template>
  <view class="i">
    <view class="item" v-for="(i, index) in list" :key="index">
      {{ i }}
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      bannerdata: [],
      tabBar: [
        {
          name: "新歌速递",
        },
        {
          name: "热门歌单",
        },
        {
          name: "排行榜",
        },
        {
          name: "MV",
        },
      ],
      list: ["A", "B", "C", "D", "E", "f"],
      oldh: "",
      newh: "",
    };
  },
  onPullDownRefresh: function () {
    let arrl = ["1", "2", "3", "4", "5"];
    let _this = this;
    this.list = [...arrl, ...this.list];
   

    setTimeout(function () {
      uni.getSystemInfo({
        success(res) {
          _this.phoneHeight = res.windowHeight;
          console.log(res.windowHeight);
          // 计算组件的高度
          let view = uni.createSelectorQuery().select(".i");
          view
            .boundingClientRect((data) => {
              _this.navHeight = data.height;
              _this.newh = data.height;
              let height = _this.newh - _this.oldh;

              uni.pageScrollTo({
                duration: 0, // 毫秒
                scrollTop: height, // 位置
              });
              _this.oldh = _this.newh;
              console.log(_this.oldh, _this.newh);
            })
            .exec();
        },
      });
    }, 10);
     uni.stopPullDownRefresh();
  },
  onPageScroll(res) {
    console.log("高度", res.scrollTop); //距离页面顶部距离
  },
  onLoad() {
    let _this = this;
    uni.getSystemInfo({
      success(res) {
        _this.phoneHeight = res.windowHeight;
        console.log(res.windowHeight);
        // 计算组件的高度
        let view = uni.createSelectorQuery().select(".i");
        view
          .boundingClientRect((data) => {
            console.log(data);
            // _this.navHeight = data.height;
            _this.oldh = data.height;
            console.log("旧", _this.oldh);
            _this.scrollviewHigh = _this.phoneHeight - _this.navHeight;
          })
          .exec();
      },
    });
  },
  methods: {},
};
</script>
<style lang="less">
.banner {
  height: 300rpx;
}
.banner-image {
  width: 110%;
}
.i {
  background-color: red;
  .item {
    height: 200px;
    background-color: skyblue;
  }
}
</style>

如果需要兼容app的话,把onload中的数据放到mounted