[RN] React Native Image 實現placeholder佔位圖

React Native Image 實現placeholder佔位圖html

react-native Image沒有placeholder這樣的props,可是業務有須要這種場景, 解決方法爲:react

  • 使用ImageBackground包裹Image,若是圖片有透明度,背景圖和網絡加載的圖片就疊加在一塊兒了

 組件類ImageView.jsreact-native

import React from 'react';
import {Image, StyleSheet, View, ViewPropTypes} from 'react-native';
import PropTypes from 'prop-types';

class ImageView extends React.PureComponent {
static propTypes = {
source: PropTypes.object,
style: ViewPropTypes.style,
placeholderSource: PropTypes.number.isRequired,
};
state: {
loading: boolean;
};

constructor(props) {
super(props);
this.state = {loading: true,};
}

render() {
return (<View style={this.props.style}>
<Image style={[this.props.style, styles.imageStyle]} source={this.props.source} onLoad={() => this.setState({loading: false})}/>
{this.state.loading ?
<Image style={[this.props.style, styles.imageStyle]} source={this.props.placeholderSource}/> : null}
</View>
);
}

}

const styles = StyleSheet.create({
imageStyle: {
position: 'absolute',
top: 0,
right: 0,
left: 0,
bottom: 0
}
});

export default ImageView;

 

2、使用網絡

<ImageView style={styles.icon} source={{uri: imageUrl}} placeholderSource={require("./img/icon.png")}/>

 

本博客地址: wukong1688ui

本文原文地址:http://www.javashuo.com/article/p-zzkuglof-hn.htmlthis

轉載請著名出處!謝謝~~spa

相關文章
相關標籤/搜索