React Native 组件之Image

时间:2023-03-08 22:12:42

Image组件类似于iOS中UIImage控件,该组件可以通过多种方式加载图片资源。

使用方式,加载方式有如下几种:

/**
* Sample React Native App
* https://github.com/facebook/react-native
* 周少停
* image 加载的三种方式+设置图片的内容模式
*/ import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
Image,
View,
} from 'react-native' class Project extends Component {
render() {
return (
<View style={styles.container}>
<Text>加载工程中图片</Text>
<Image source={require('./imgs/1111.png')} style={{width:120,height:120}}/>
<Text>加载Xcode中asset的图片,也可以使用uri的方式加载</Text>
<Image source={require('image!520')} style={{width:120,height:120}} />
<Text>加载网络中的图片</Text>
<Image source={{uri:'https://unsplash.it/600/400/?random'}} style={{width:120,height:200}}/>
<Text>设置加载图片的模式</Text>
<Image source={{uri:'https://unsplash.it/600/400/?random'}} style={{width:120,height:200,resizeMode:Image.resizeMode.cover}}/>
<Image source={{uri:'https://unsplash.it/600/400/?random'}} style={{width:120,height:200,resizeMode:Image.resizeMode.contain}}/>
<Image source={{uri:'https://unsplash.it/600/400/?random'}} style={{width:120,height:200,resizeMode:Image.resizeMode.stretch}}/>
</View>
);
}
} const styles = StyleSheet.create({
container: {
flex: 1,
marginTop:20,//上边距
flexDirection:'column',//主轴方向 垂直
justifyContent: 'flex-start',//控件在主轴上的对齐方向
alignItems: 'flex-start', //控件在侧轴上的对齐方向
backgroundColor: '#F5FCFF',
}
}); AppRegistry.registerComponent('Project', () => Project);
/**
* Sample React Native App
* https://github.com/facebook/react-native
* 周少停 2016-09-13
* Imaage的常见属性
*/ import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
Image
} from 'react-native';
//导入json数据
var BadgeData = require('./BadgeData.json'); //定义一些全局变量
var Dimensions = require('Dimensions');
var {width} = Dimensions.get('window'); //屏宽
var cols = 3 //总列数
var boxW = 100; //单个盒子的宽度&高度
var vMargin = (width - cols*boxW)/(cols + 1);//盒子中间的水平间距
var hMargin = 25; class Project extends Component {
render() {
return (
<View style={styles.container}>
{/*返回包的数据*/}
{this.renderAllBadge()}
</View>
);
}
//返回所有的包
renderAllBadge(){
//定义一个数组,装每个包的信息
var allBadge = [];
//遍历json数据
for(var i=0;i<BadgeData.data.length;i++){
//去除单独的数据对象
var badge = BadgeData.data[i];
//直接装入数组
allBadge.push(
<View key={i} style={styles.outViewStyle}>
<Image source={{uri:badge.icon}} style={styles.imageStyle} />
<Text style={styles.mainTitleStyle}>
{badge.title}
</Text>
</View>
);
}
//返回数组
return allBadge;
}
} const styles = StyleSheet.create({
container: {
flex: 1,
marginTop:20,//上边距
flexDirection:'row',//主轴方向,水平
alignItems:'flex-start',//定义控件在侧轴上的对齐方式
flexWrap:'wrap',//是否换行
backgroundColor: '#F5FCFF'
},
outViewStyle: {
backgroundColor:'gray',
alignItems:'center',
width:boxW,
height:boxW,
marginLeft:vMargin,
marginBottom:hMargin
},
imageStyle:{
width:80,
height:80
},
mainTitleStyle:{
color:'white'
}
}); AppRegistry.registerComponent('Project', () => Project);

  

 完整源码下载:https://github.com/pheromone/React-Native-1