最近几天学了几个ReactNative组件，总觉得单纯的学几个组件进步慢，所以我打算做一些综合性的小案例，练习下实战，我从网上找到一个小案例 ，感觉挺好，也学习了很多，代码内容可能不太一样，主要区别是：我把RN官方不推荐或者已经放弃了的组件进行了替换，如果有需要的可以互相参考下
接着上篇案例开始写，这篇文章将会讲解如何怎样利用WebView加载HTML文件。
在WYNewsDetail.js文件写如下代码：
import React, { Component } from 'react';
import {
StyleSheet,
Text,
View,
WebView
} from 'react-native';
import Request from '../Utils/WYRequest';
export default class WYNewsDetail extends Component {
static navigationOptions = ({ navigation }) => ({
title: navigation.state.params.title,
});
constructor(props){
super(props);
this.state = {
docid:'',
};
}
componentDidMount() {
const {params} = this.props.navigation.state;
this.setState({
docid: params.docid,
html: '',
});
var url_api = 'http://c.m.163.com/nc/article/' + params.docid + '/full.html';
Request.get(url_api, (responseData) => {
// 取出数据
var allData = responseData[this.state.docid];
var body = allData['body'];
// 取出图片
var img = allData['img'];
for (var i = 0; i < img.length; i++) {
var item = img[i];
var ref = item.ref;
var src = item.src;
var newImg = '<img src="'+ src +'" width="100%">';
body = body.replace(ref, newImg);
console.log('====================================');
console.log(ref, src);
console.log('====================================');
}
// 更新UI
this.setState({
html: body,
});
}, (error) => {
alert(error);
});
}
render() {
return (
<WebView
automaticallyAdjustContentInsets={true}
// source= 加载网页
source=
javaScriptEnabled={true}
domStorageEnabled={true}
startInLoadingState={true}
/>
);
}
}
const styles = StyleSheet.create({
background: {
backgroundColor: 'red',
flex: 1,
justifyContent: 'center',
alignItems:'center'
},
textStyle: {
fontSize:30,
}
});
主要知识点：
- 界面传值
static navigationOptions = ({ navigation }) => ({
title: navigation.state.params.title,
});
componentDidMount() {
const {params} = this.props.navigation.state;
this.setState({
docid: params.docid,
html: '',
});
还有一个bug，就是当界面跳转的时候，左上角返回按钮和文字依旧是系统的蓝色，如何修改颜色，就用到了自定义功能了
const StackOptions = ({navigation}) => {
console.log(navigation);
let {state,goBack} = navigation;
// 用来判断是否隐藏或显示header
const visible= state.params.isVisible;
let header;
if (visible === true){
header = null;
}
const headerStyle = {backgroundColor:'#4ECBFC'};
const headerTitle = state.params.title;
const headerTitleStyle = {fontSize:FONT_SIZE(20),color:'white',fontWeight:'500'}
const headerBackTitle = false;
const headerLeft = (
<Button
isCustom={true}
customView={
<Icon
name='ios-arrow-back'
size={30}
color='white'
style=
/>
}
onPress={()=>{goBack()}}
/>
);
return {headerStyle,headerTitle,headerTitleStyle,headerBackTitle,headerLeft,header}
};
通过下面的方式调用：
const MyApp = StackNavigator({
MyTab: {
screen: MyTab,
},
Detail: {
screen: Detail,
navigationOptions: ({navigation}) => StackOptions({navigation})
},
)};
至此第一个小案例就做完了
效果图
