Javascript 使用卡视图从服务器获取数据时作出反应
我想使用card view react native从服务器获取数据,但当我打开activity时,它仍在加载,代码中的错误在哪里Javascript 使用卡视图从服务器获取数据时作出反应,javascript,android,ios,reactjs,react-native,Javascript,Android,Ios,Reactjs,React Native,我想使用card view react native从服务器获取数据,但当我打开activity时,它仍在加载,代码中的错误在哪里 renderItem = ({ item }) => { return ( <Card> <CardItem cardBody> <Image source={{ uri: 'http://bprwasa.com/assets/frontend/images/gallery/kpo.jpg' }} styl
renderItem = ({ item }) => {
return (
<Card>
<CardItem cardBody>
<Image source={{ uri: 'http://bprwasa.com/assets/frontend/images/gallery/kpo.jpg' }} style={{ height: 200, width: null, flex: 1 }} />
</CardItem>
<CardItem>
<Body>
<Text>
{item.nama_wil}
</Text>
</Body>
</CardItem>
</Card>
)}
renderItem=({item})=>{
返回(
{item.nama_wil}
)}
还有这个
render() {
return (
this.state.isLoading
?
<View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
<ActivityIndicator size='large' color='#330066' animating />
</View>
:
<Container>
<Content>
{this.state.dataSource}
{this.renderItem}
</Content>
</Container>
)}}
render(){
返回(
此.state.isLoading
?
:
{this.state.dataSource}
{this.renderItem}
)}}
在您的情况下,问题是您没有将活动指示器的属性设置为false
import React, { Component } from "react";
import { ActivityIndicator, StyleSheet } from "react-native";
export default class ActivityProgress extends Component {
constructor(props) {
super(props);
this.state = {
showActivityIndicator: props.showActivityIndicator
};
}
componentDidUpdate(prevProps) {
if (this.props.showActivityIndicator != prevProps.showActivityIndicator) {
this.setState({
showActivityIndicator: this.props.showActivityIndicator
});
}
}
render() {
return (
<ActivityIndicator
size={isAndroid() ? 100 : "large"}
color="red"
animating={true}
style={[
{ opacity: this.state.showActivityIndicator ? 1 : 0 },
styles.spinnerLoading
]}
/>
);
}
}
const styles = StyleSheet.create({
spinnerLoading: {
position: "absolute",
left: 0,
right: 0,
top: 0,
bottom: 0,
alignItems: "center",
justifyContent: "center"
}
});
但是,同样重要的是要注意,在react native version0.58.3
之前,仍然存在一个bug,请检查
解决方案
使用此可重用组件,因为它具有解决方法{opacity:this.state.showActivityIndicator?1:0}
确保将其属性showActivityIndicator
设置为true
和false
import React, { Component } from "react";
import { ActivityIndicator, StyleSheet } from "react-native";
export default class ActivityProgress extends Component {
constructor(props) {
super(props);
this.state = {
showActivityIndicator: props.showActivityIndicator
};
}
componentDidUpdate(prevProps) {
if (this.props.showActivityIndicator != prevProps.showActivityIndicator) {
this.setState({
showActivityIndicator: this.props.showActivityIndicator
});
}
}
render() {
return (
<ActivityIndicator
size={isAndroid() ? 100 : "large"}
color="red"
animating={true}
style={[
{ opacity: this.state.showActivityIndicator ? 1 : 0 },
styles.spinnerLoading
]}
/>
);
}
}
const styles = StyleSheet.create({
spinnerLoading: {
position: "absolute",
left: 0,
right: 0,
top: 0,
bottom: 0,
alignItems: "center",
justifyContent: "center"
}
});
import React,{Component}来自“React”;
从“react native”导入{ActivityIndicator,StyleSheet};
导出默认类ActivityProgress扩展组件{
建造师(道具){
超级(道具);
此.state={
showActivityIndicator:props.showActivityIndicator
};
}
componentDidUpdate(prevProps){
if(this.props.showActivityIndicator!=prevProps.showActivityIndicator){
这是我的国家({
showActivityIndicator:this.props.showActivityIndicator
});
}
}
render(){
返回(
);
}
}
const styles=StyleSheet.create({
喷丝头加载:{
位置:“绝对”,
左:0,,
右:0,,
排名:0,
底部:0,
对齐项目:“中心”,
为内容辩护:“中心”
}
});
希望这有帮助 您是否正在使用本机基址
?是,我正在使用本机基址