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@yqz0203/rn-lazyload

v0.0.3

Published

enjoy easier lazyload

Downloads

4

Readme

rn-lazyload

react-native懒加载组件,简单易用,方便扩展。

安装

yarn add @yqz0203/rn-lazyload(建议)

或者

npm install @yqz0203/rn-lazyload

使用

/**
* ScrollView example
*/

import React, { Component } from 'react'
import {
 Platform,
 StyleSheet,
 Text,
 View,
 ScrollView
} from 'react-native';

import { lazyloadComponent, lazyloadContainer, LazyloadImage } from 'rn-lazyload'

const LazyScrollView = lazyloadContainer(ScrollView)

const data = []
for (let i = 0; i < 20; i++) {
 data.push({ key: i })
}

export default class App extends Component {
 render() {
   return (
     <View style={styles.container}>
       <LazyScrollView style={styles.container} scrollEventThrottle={16}>
         {data.map((item) => <LazyloadImage
           style={{ height: 200, width: 200 }}
           source={{ uri: 'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=792258386,3657525489&fm=27&gp=0.jpg' }}
           key={item.key} />)}
       </LazyScrollView>
     </View>
   );
 }
}

const styles = StyleSheet.create({
 container: {
   flex: 1,
   backgroundColor: '#F5FCFF',
 },
 welcome: {
   fontSize: 20,
   textAlign: 'center',
   margin: 10,
 },
 instructions: {
   textAlign: 'center',
   color: '#333333',
   marginBottom: 5,
 },
})

layloadContainer(Component)

高阶组件,包裹一个可滚动组件(例如:ScrollView, FlatListView等)返回一个懒加载容器。

import {lazyloadContainer} from 'rn-lazyload'
import {ScrollView} from 'react-native'
const LazyScrollView = lazyloadContainer(ScrollView)
//....
return (
  <LazyScrollView>
    {/*...*/}
  </LazyScrollView>
)
//...

容器支持被包裹组件的全部props,且所有在LazyScrollView中的被lazyloadComponent包裹的子组件开始支持懒加载。

因为某些原因,容器的最外层加上了一个额外<View>组件,可以通过传入额外的wrapperStyle定义其样式。默认样式为{flex:1}

支持的props

  • 所有被包裹组件的全部props

  • wrapperStyle

默认:{flex:1}

layloadComponent(Component,config)

高阶组件,包裹一个任意组件,使其成一个支持懒加载的组件。这里需要注意的是,组件自身并不是懒加载的,而是子元素是懒加载的,目的是为了达到更细致的控制已经更好的扩展性。

注意:所有懒加载组件只有在懒加载容器中才会有效果

返回的组件支持传入一个函数作为子元素,函数的参数为boolean类型,表示当前元素是否在视图中。通过这个状态,我们可以自行决定内容的显示或隐藏。

import {lazyloadComponent} from 'rn-lazyload'
import {View,Text} from 'react-native'
const LazyloadView = lazyloadContainer(View)
//....
return (
  <LazyloadView>
    {
      (inViewPort)=>{
        if(inViewPort){
          return null
        }
        return <Text>hello</Text>
      }
    }
  </LazyloadView>
)
//...

config

  • threshold {number} 阈值

默认:50

props

所有被包裹组件的属性

注意: 被包裹组件应该有确定的高度,因为组件只会在初始化时计算自己的偏移量,也就是说如果元素在页面的位置会发生改变,内部计算的偏移量将不会更新。如果组件没有确定的高度,可能会发生奇怪的现象。

LazyloadImage

内部实现的支持懒加载的图片组件。

props

  • placeholder {source}

图片占位符

  • source

原图的地址

  • style

这里的样式并不是图片的样式,而是包括图片的View的样式,图片将会填充满整个View

例子

git clone https://github.com/yqz0203/rn-lazyload.git

cd example && yarn

react-native run ios

测试环境

react-native-cli 2.0.1 [email protected]