How does uniapp achieve an effect similar to native strip pages?

In recent years, as the penetration rate of smartphones continues to increase, more and more people have begun to use mobile phones to browse the Internet, and applications have also increased rapidly. In order to provide a better user experience, many applications use native strip page effects. So, how to achieve a similar native strip page effect in uniapp?

1. What is the native strip page effect?

The native strip page effect refers to the strip effect with shadows and color gradients that is common in native applications such as Android and iOS. When the page is pulled up and down, a strip effect will appear. This effect is simple, beautiful, and visually striking, and users like it very much.

2. How does uniapp achieve the native strip page effect?

To achieve an effect similar to the native strip page, you can use $refs and $emit provided by uniapp to pass events between components. The specific implementation steps are as follows:

1. Introduce the component into the page

<template>
  <view>
    <custom-header class="header" ref="header"></custom-header>
    <scroll-view :style="{ top: component_top + &#39;px&#39; }" class="content" @scroll="contentScroll">
      <!-- 内容区域 -->
    </scroll-view>
  </view>
</template>

<script>
import customHeader from './components/custom-header.vue'; // 引入自定义头部组件

export default {
  components: {
    customHeader
  },
  data() {
    return {
      component_top: 0,
      scroll_top: 0,
    }
  },
  methods: {
    /**
     * 改变自定义头部组件的透明度
     */
    changeHeaderOpacity() {
      let opacity = this.scroll_top / 100;
      if (opacity > 1) {
        opacity = 1;
      }
      this.$refs.header.changeOpacity(opacity);
    },
    /**
     * 监听页面滚动
     * @param {Object} event
     */
    contentScroll(event) {
      this.scroll_top = event.detail.scrollTop;
      this.changeHeaderOpacity();
    },
  },
};
</script>

<style>
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99;
}
.content {
  padding-top: 44px; /* 头部高度 */
  /* 内容区域样式 */
}
</style>

2. Customize the header component

<template>
  <view class="custom-header">
    <view :style="{ opacity: opacity }" class="header-main">
      <!-- 头部内容 -->
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      opacity: 0,
    }
  },
  methods: {
    /**
     * 改变透明度
     */
    changeOpacity(opacity) {
      this.opacity = opacity;
    },
  },
};
</script>

<style>
.custom-header {
  height: 44px; /* 头部高度 */
  background-color: #fff;
  box-shadow: 0 1.5px 3px 0 #e3e3e3;
  -webkit-transition: all .2s ease-out;
  transition: all .2s ease-out;
}
.header-main {
  height: 44px; /* 头部高度 */
  -webkit-transition: opacity .2s ease-out;
  transition: opacity .2s ease-out;
}
</style>

The above code implements a custom header component and a scroll view for the content area. When scrolling in the content area, by listening to the scroll event and calculating the scrolling distance, it is passed to the custom header component to achieve a strip page effect similar to the native one.

3. Summary

To achieve a similar native strip page effect in uniapp, you need to realize the linkage between the custom header component and the scroll view component. By using $refs and $emit provided by uniapp, we can easily implement event delivery between components. The above steps provide a basic idea, and readers can customize the implementation according to actual needs.

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