react native ES6學習 image組件

import React, { Component } from 'react'; import { StyleSheet, Text, AppRegistry, View, Image, TouchableOpacity } from 'react-native';

var imgs = [ 'http://vczero.github.io/ctrip/hua2.png', 'http://vczero.github.io/ctrip/nian2.png', 'http://vczero.github.io/me/img/xiaoxue.png' ]; class MyImage extends Component {

constructor(props) {
    super(props);
    this.state = {
        imgs: imgs,
        count: 0
    }
}

goNext(){
    let count = this.state.count;
    count ++;
    if(count < imgs.length){
        this.setState({
            count: count
        });
    }
}
goPreview(){
    let count = this.state.count;
    count --;
    if(count >= 0){
        this.setState({
            count: count
        });
    }
}
render(){
    return(
        <View style={[styles.flex]}>
            <View style={styles.image}>
                <Image style={styles.img}
                       source={{uri: this.state.imgs[this.state.count]}}
                       resizeMode="contain"
                />
            </View>
            <View style={styles.btns}>
                <TouchableOpacity onPress={this.goPreview.bind(this)}>
                    <View style={styles.btn}>
                        <Text>上一張</Text>
                    </View>
                </TouchableOpacity>
                <TouchableOpacity onPress={this.goNext.bind(this)}>
                    <View style={styles.btn}>
                        <Text>下一張</Text>
                    </View>
                </TouchableOpacity>
            </View>
        </View>
    );
}

}

class HelloWorld extends Component { render(){ return( <View style={[styles.flex, {marginTop:40}]}> <MyImage imgs={imgs}></MyImage> </View> ); } };

var styles = StyleSheet.create({ flex:{ flex: 1, alignItems:'center' }, image:{ borderWidth:1, width:300, height:200, borderRadius:5, borderColor:'#ccc' }, img:{ height:200, width:300, }, btns:{ flexDirection: 'row', justifyContent: 'center', marginTop:20 }, btn:{ width:60, height:30, borderColor: '#0089FF', borderWidth: 1, justifyContent: 'center', alignItems:'center', borderRadius:3, marginRight:20, }, });

AppRegistry.registerComponent('HelloWorld', () => HelloWorld);