React Native Image 實現placeholder占位圖
react-native Image沒有placeholder這樣的props,但是業務有需要這種場景, 解決方法為:
- 使用ImageBackground包裹Image,如果圖片有透明度,背景圖和網絡加載的圖片就疊加在一起了
組件類ImageView.js
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;
二、使用
<ImageView style={styles.icon} source={{uri: imageUrl}} placeholderSource={require("./img/icon.png")}/>
本博客地址: wukong1688
本文原文地址:https://www.cnblogs.com/wukong1688/p/10983879.html
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