问题是,当我只使用滑块而应用程序中没有其他代码时,只实现滑块,那么滑块就没有问题。但是当我将滑块与其他组件一起使用时,即屏幕上有很多状态变量和组件时,滑块会滞后,并且状态值的变化很晚才反映在屏幕上。
我也使用了 lodash 的 debounce,但我没有工作,虽然它在一定程度上解决了滞后问题,但由于我必须实时更新状态并将其显示在屏幕上,所以反映在屏幕上的值的变化正在发生时间。
请有人告诉如何解决这个问题。下面的代码 HomeScreen.js正在产生问题。 下面的代码正在创建问题,滑块滞后并且状态值没有立即改变,即它反映了最近屏幕上滑块值的变化我认为是由于 VictoryChart 组件
要查看 Gif 的更多详细信息有什么问题,请单击此处
import React, { Component } from 'react'
import {View,StyleSheet,Text,ScrollView} from 'react-native';
import _ from 'lodash';
import { Slider} from 'react-native-elements';
import {VictoryArea,VictoryChart,createContainer,VictoryTheme, VictoryTooltip,VictoryBar} from 'victory-native';
import {Defs,LinearGradient,Stop} from 'react-native-svg';
sampleData=[
{ key:'1',x: 'Jan', y: 5.5, c0: 2,date:'18 Jan 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'2',x: 'Feb', y: 3, c0: 1.5, date:'08 Feb 2019',bank:'Bank Of Baroda',txid:'76jhdg74rh4h848r58'},
{ key:'3',x: 'March', y: 5, c0: 2 ,date:'19 March 2019',bank:'State Bank of India',txid:'76jhdg74rh4h848r58'},
{ key:'4',x: 'Apr', y: 4, c0: 1 ,date:'18 Apr 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'5',x: 'May', y: 6, c0: 2 ,date:'15 May 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'6',x: 'June', y: 2, c0: 4 ,date:'11 June 2019',bank:'Canara Bank',txid:'76jhdg74rh4h848r58'},
{ key:'7',x: 'July', y: 3, c0: 1 ,date:'28 July 2019',bank:'Punjab National Bank',txid:'76jhdg74rh4h848r58'},
]
export default class HomeScreen extends Component{
static navigationOptions = {
title:'Annual Employee’s Contribution',
}
state = {
search: '',
slider:0,
age:'0',
value:0,
overrideSlider:true
};
sliderChanger =(slider) =>{
this.setState({slider})
}
render(){
const VictoryZoomVoronoiContainer = createContainer( "voronoi","cursor");
return(
<View style = {styles.container} >
<ScrollView >
<Slider
value={this.state.slider}
onValueChange={value => {this.sliderChanger(value) }}
maximumValue={100}
step={1}
/>
<Text>Value: {this.state.slider}</Text>
<View>
<VictoryChart
domain={{ y: [0, 7] }}
theme={VictoryTheme.material}
containerComponent={
<VictoryZoomVoronoiContainer
labels={(d) => `${d.x}, ${d.y}`}
labelComponent={
<VictoryTooltip
cornerRadius={(d) => d.x > 6 ? 0 : 20}
pointerLength={(d) => d.y > 0 ? 5 : 20}
flyoutStyle={{
stroke: (d) => d.x === 10 ?
"tomato" : "black"
}}/>}
/>
}
>
<Defs>
<LinearGradient id="gradientStroke"
x1="0%"
x2="0%"
y1="0%"
y2="100%"
>
<Stop offset="10%" stopColor="#008aefcb" stopOpacity="1" />
<Stop offset="100%" stopColor="#52da9c" stopOpacity="0" />
</LinearGradient>
</Defs>
<VictoryArea
data={sampleData}
interpolation="cardinal"
style={{
data: {
fill: 'url(#gradientStroke)',
stroke: '#1E93FA',
strokeWidth: 2
}
}}
/>
</VictoryChart>
</View>
</ScrollView>
</View>
);
}
}
现在移除 VictoryChart 滑块时工作正常
import React, { Component } from 'react'
import {View,StyleSheet,Text,ScrollView} from 'react-native';
import _ from 'lodash';
import { Slider} from 'react-native-elements';
import {VictoryArea,VictoryChart,createContainer,VictoryTheme, VictoryTooltip,VictoryBar} from 'victory-native';
import {Defs,LinearGradient,Stop} from 'react-native-svg';
sampleData=[
{ key:'1',x: 'Jan', y: 5.5, c0: 2,date:'18 Jan 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'2',x: 'Feb', y: 3, c0: 1.5, date:'08 Feb 2019',bank:'Bank Of Baroda',txid:'76jhdg74rh4h848r58'},
{ key:'3',x: 'March', y: 5, c0: 2 ,date:'19 March 2019',bank:'State Bank of India',txid:'76jhdg74rh4h848r58'},
{ key:'4',x: 'Apr', y: 4, c0: 1 ,date:'18 Apr 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'5',x: 'May', y: 6, c0: 2 ,date:'15 May 2019',bank:'Bank Of India',txid:'76jhdg74rh4h848r58'},
{ key:'6',x: 'June', y: 2, c0: 4 ,date:'11 June 2019',bank:'Canara Bank',txid:'76jhdg74rh4h848r58'},
{ key:'7',x: 'July', y: 3, c0: 1 ,date:'28 July 2019',bank:'Punjab National Bank',txid:'76jhdg74rh4h848r58'},
]
export default class HomeScreen extends Component{
static navigationOptions = {
title:'Annual Employee’s Contribution',
}
state = {
search: '',
slider:0,
age:'0',
value:0,
overrideSlider:true
};
sliderChanger =(slider) =>{
this.setState({slider})
}
render(){
const VictoryZoomVoronoiContainer = createContainer( "voronoi","cursor");
return(
<View style = {styles.container} >
<ScrollView >
<Slider
value={this.state.slider}
onValueChange={value => {this.sliderChanger(value) }}
maximumValue={100}
step={1}
/>
<Text>Value: {this.state.slider}</Text>
<View>
</View>
</ScrollView>
</View>
);
}
}
const styles = StyleSheet.create({
container:{
backgroundColor:'#f8f8f8',
flex:1
},
})