UniApp Design and Development Guide for Implementing Customized Refresh and Loading Effects

UniApp Design and Development Guide for Implementing Customized Refresh and Loading Effects

Introduction:
UniApp is a cross-platform application development framework based on Vue.js, which can run a set of codes at the same time On multiple platforms, such as iOS, Android, H5, etc. In mobile application development, pull-down to refresh and pull-up to load more are very common functions. Although UniApp already provides some default pull-down refresh and pull-up loading effects, sometimes we may need to customize effects or styles to meet specific needs. This article will introduce how to implement customized pull-down refresh and pull-up loading effects in UniApp, and attach corresponding code examples.

1. Design and development of pull-down refresh

Pull-down refresh is when the user pulls down on the top of the list to trigger a refresh operation. Usually a refresh animation will appear and the list data will be updated. . UniApp provides the uni-app-pull-down-refresh component to achieve the default pull-down refresh effect, but we can achieve a more personalized effect by customizing the component.

First, introduce the custom component in the json file of the page:

{
  "usingComponents": {
    "custom-refresh": "@/components/custom-refresh"
  }
}

Then, use the custom component in the vue file of the page:

<template>
  <view>
    <!-- 列表展示 -->
    <custom-refresh @refresh="onRefresh">
      <view v-for="(item, index) in list" :key="index">{{ item }}</view>
    </custom-refresh>
  </view>
</template>

In the custom component In the vue file, you can use the onPullDownRefresh life cycle method to listen to the pull-down refresh event and trigger the corresponding operation:

<script>
  export default {
    methods: {
      onRefresh() {
        // 在这里进行下拉刷新的逻辑处理
        // 更新列表数据、重置页面状态等
      }
    },
    onPullDownRefresh() {
      // 触发下拉刷新事件
      this.onRefresh();
    }
  }
</script>

2. The design and development of pull-up loading

Pull-up loading is an operation in which the user pulls up at the bottom of the list to trigger the loading of more data. Similar to pull-down refresh, UniApp provides the uni-app-load-more component by default to achieve the pull-up loading effect, but we can also achieve more personalized effects through custom components.

First, introduce the custom component in the json file of the page:

{
  "usingComponents": {
    "custom-load-more": "@/components/custom-load-more"
  }
}

Then, use the custom component in the vue file of the page:

<template>
  <view>
    <!-- 列表展示 -->
    <custom-load-more @loadMore="onLoadMore">
      <view v-for="(item, index) in list" :key="index">{{ item }}</view>
    </custom-load-more>
  </view>
</template>

In the custom component In the vue file, you can use the onReachBottom life cycle method to listen to the pull-up loading event and trigger the corresponding operation:

<script>
  export default {
    methods: {
      onLoadMore() {
        // 在这里进行上拉加载的逻辑处理
        // 追加新的列表数据、更新页面状态等
      }
    },
    onReachBottom() {
      // 触发上拉加载事件
      this.onLoadMore();
    }
  }
</script>

Summary:
This article introduces how to use sample code to Implement customized pull-down refresh and pull-up loading effects in UniApp. Through custom components and corresponding life cycle methods, we can flexibly control the refresh and loading logic and achieve personalized effects. I hope this guide will be helpful to everyone in implementing customized refresh and loading effects in UniApp development.

The above is the detailed content of UniApp Design and Development Guide for Implementing Customized Refresh and Loading Effects. For more information, please follow other related articles on the PHP Chinese website!