ReactNative H5 页面显示 react-native-webview 高度自适应

柔情只为你懂 2022-12-12 04:51 243阅读 0赞

## 安装包 ##

react-native-webview

## 简单示例 ##

import React from 'react'
    import WebView from 'react-native-webview'
    
    class Component extends React.Component { 
        createHtml() { 
            return ` <div id="canvas" style=""></div> <script> window.onload = function () { } </script> `
    }
    
        render() { 
            return (
                <WebView
                    source={ {  html: this.createHtml() }}
                />
            );
        }
    }
    
    export default Component;

## 高度自适应 ##

import React from 'react'
    import WebView from 'react-native-webview'
    
    interface Props { 
        html: string
    }
    
    export default class IEWebView extends React.Component<Props> { 
        state = { 
            webHeight: 0
        }
    
        constructor(props) { 
            super(props);
        }
    
        createHtml(html) { 
            return ` <body style="margin: 0px"> <div id="__container__"> ${ html} <div></div> </div> <script> var oldonload = window.onload;//得到上一个onload事件的函数 window.onload = function () { if (typeof oldonload == 'function') { oldonload(); } setTimeout(()=>{ // 向 WebView 发送消息 let webHeight = document.getElementById("__container__").clientHeight; window.ReactNativeWebView.postMessage(webHeight); }, 1) } </script> <body> `
        }
    
        onMessage = (msg) => { 
            console.log("--------------------------")
            console.log(msg.nativeEvent)
    
            if (msg.nativeEvent.data !== undefined && msg.nativeEvent.data !== null) { 
                let height = parseInt(msg.nativeEvent.data);
                if (isNaN(height)) { 
                    height = 0;
                }
                this.setState({ 
                    webHeight: height
                });
            }
        }
    
        render() { 
            console.log(this.createHtml(this.props.html));
            return (
                <WebView
                    style={ {  width: '100%', height: this.state.webHeight }}
                    javaScriptEnabled={ true}
                    source={ {  html: this.createHtml(this.props.html) }}
                    onMessage={ this.onMessage}
                    scalesPageToFit={ false}
                />
            );
        }
    }