【发布时间】：2021-12-30 02:56:28
【问题描述】：
嗯，我想做的是我想在 react-native 中创建一个过滤器屏幕，就像我们在 Flipkart、Myntra 或 Swiggy 中看到的那样。我成功地做到了，但问题是我写的代码太长了，因为我使用了很多复选框，而且我不得不写 {useState} 的数字来处理多个复选框。那么有什么办法可以缩短我的代码，代码如下：
import React, { useState } from 'react';
import { StyleSheet, ScrollView, View, TouchableOpacity, Text, Button, FlatList } from 'react-native';
import FontAwesome from 'react-native-vector-icons/FontAwesome';
import Entypo from 'react-native-vector-icons/Entypo';
import { Checkbox, RadioButton } from 'react-native-paper';
const Filter = ({ route, navigation }) => {
const [checked1, setChecked1] = React.useState(false);
const [checked2, setChecked2] = React.useState(false);
const [checked3, setChecked3] = React.useState(false);
const [checked4, setChecked4] = React.useState(false);
const [checked5, setChecked5] = React.useState(false);
const [checked6, setChecked6] = React.useState(false);
const [checked7, setChecked7] = React.useState(false);
const [checked8, setChecked8] = React.useState(false);
const [checked9, setChecked9] = React.useState(false);
const [checked10, setChecked10] = React.useState(false);
const [checked11, setChecked11] = React.useState(false);
const [checked12, setChecked12] = React.useState(false);
const [checked13, setChecked13] = React.useState(false);
const [checked14, setChecked14] = React.useState(false);
const [checked15, setChecked15] = React.useState(false);
const [checked16, setChecked16] = React.useState(false);
const [checked17, setChecked17] = React.useState(false);
const [checked18, setChecked18] = React.useState(false);
const [checked19, setChecked19] = React.useState(false);
const [checked20, setChecked20] = React.useState(false);
const [checked21, setChecked21] = React.useState(false);
const [checked22, setChecked22] = React.useState(false);
const [radioChecked, setRadioChecked] = React.useState('first');
// All your menu options go here.
const [menuItems, setMenuItems] = React.useState([
{ id: '1', name: 'Sort', },
{ id: '2', name: 'Cuisines', },
{ id: '3', name: 'Offers & More', },
{ id: '4', name: 'Ideal for Viewing Distance dsfhj fdsfjj ', },
{ id: '5', name: 'Age', },
{ id: '6', name: 'Price', },
{ id: '7', name: 'Age', },
{ id: '8', name: 'Price', },
{ id: '9', name: 'Age', },
{ id: '10', name: 'Price', },
{ id: '11', name: 'Age', },
{ id: '12', name: 'Price', },
{ id: '13', name: 'Age', },
{ id: '14', name: 'Price', },
{ id: '15', name: 'Age', },
{ id: '16', name: 'Price', },
{ id: '17', name: 'Test', },
{ id: '18', name: 'last', },
])
// this holds the keys of the menuItems for the view to know which category is currently being rendered.
const [selectedItem, setSelectedItem] = React.useState('1')
return (
<>
<View style={{ flexDirection: "row", justifyContent: 'space-between', paddingVertical: 5 }}>
<View style={{ marginRight: 15, flexDirection: 'row', alignItems: 'center', }}>
<TouchableOpacity onPress={() => { navigation.goBack() }}>
<Entypo name={'cross'} style={{ marginRight: 12, marginLeft: 5, }} size={30} />
</TouchableOpacity>
<Text style={{ fontSize: 18, fontWeight: 'bold', color: '#000' }}>Sort/Filter</Text>
</View>
<View style={{ marginRight: 15, marginLeft: 15, paddingVertical: 5, }}>
<TouchableOpacity onPress={() => alert('Clear All Pressed')} >
<Text style={{ color: 'red', fontWeight: 'bold' }}>CLEAR ALL</Text>
</TouchableOpacity>
</View>
</View>
<View style={styles.content}>
<View style={styles.menuColumn}>
<ScrollView contentInsetAdjustmentBehavior="automatic" showsVerticalScrollIndicator={false} showsHorizontalScrollIndicator={false}>
{menuItems.map(
(item, index) => {
return (
<TouchableOpacity key={item.id} onPress={() => setSelectedItem(item.id)} style={[styles.menuItem, item.id === selectedItem ? styles.selectedMenuItem : null]}>
<Text numberOfLines={2} style={styles.menuItemText}>{item.name}</Text>
</TouchableOpacity>
)
}
)
}
</ScrollView>
</View>
<View style={styles.settingsColumn}>
<ScrollView contentInsetAdjustmentBehavior="automatic" showsVerticalScrollIndicator={false} showsHorizontalScrollIndicator={false}>
{
selectedItem === '1' &&
<View style={styles.settingsView} >
<Text style={{ textTransform: 'uppercase' }}>Show Restaurants By</Text>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<RadioButton
value="first"
status={radioChecked === 'first' ? 'checked' : 'unchecked'}
onPress={() => setRadioChecked('first')}
/>
<Text>Relevance</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<RadioButton
value="second"
status={radioChecked === 'second' ? 'checked' : 'unchecked'}
onPress={() => setRadioChecked('second')}
/>
<Text>Delivery Time</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<RadioButton
value="third"
status={radioChecked === 'third' ? 'checked' : 'unchecked'}
onPress={() => setRadioChecked('third')}
/>
<Text>Rating</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<RadioButton
value="fourth"
status={radioChecked === 'fourth' ? 'checked' : 'unchecked'}
onPress={() => setRadioChecked('fourth')}
/>
<Text>Cost: Low to High</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<RadioButton
value="fifth"
status={radioChecked === 'fifth' ? 'checked' : 'unchecked'}
onPress={() => setRadioChecked('fifth')}
/>
<Text>Cost: High to Low</Text>
</View>
</View>
}
{
selectedItem === '2' &&
<View style={styles.settingsView} >
<Text>CUISINES</Text>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked1 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked1(!checked1);
}}
/>
<Text>American</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked2 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked2(!checked2);
}}
/>
<Text>Andhra</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked3 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked3(!checked3);
}}
/>
<Text>Arabian</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked4 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked4(!checked4);
}}
/>
<Text>Asian</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked5 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked5(!checked5);
}}
/>
<Text>Barbecue</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked6 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked6(!checked6);
}}
/>
<Text>Beverages</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked7 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked7(!checked7);
}}
/>
<Text>Biryani</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked8 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked8(!checked8);
}}
/>
<Text>Chinese</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked9 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked9(!checked9);
}}
/>
<Text>Continental</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked10 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked10(!checked10);
}}
/>
<Text>Combo</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked11 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked11(!checked11);
}}
/>
<Text>Desserts</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked12 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked12(!checked12);
}}
/>
<Text>Europian</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked13 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked13(!checked13);
}}
/>
<Text>Fast Food</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked14 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked14(!checked14);
}}
/>
<Text>Grill</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked15 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked15(!checked15);
}}
/>
<Text>Healthy Food</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked16 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked16(!checked16);
}}
/>
<Text>Hydrabadi</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked17 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked17(!checked17);
}}
/>
<Text>Ice Cream</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked18 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked18(!checked18);
}}
/>
<Text>Indian</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked19 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked19(!checked19);
}}
/>
<Text>Italian</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked20 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked20(!checked20);
}}
/>
<Text>Juices</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked21 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked21(!checked21);
}}
/>
<Text>Kebabs</Text>
</View>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Checkbox
status={checked22 ? 'checked' : 'unchecked'}
onPress={() => {
setChecked22(!checked22);
}}
/>
<Text>Maxican</Text>
</View>
</View>
}
{
selectedItem === '3' &&
<View style={styles.settingsView} >
<Text>Anything can go here</Text>
</View>
}
</ScrollView>
</View>
</View>
<View style={{ flexDirection: "row", justifyContent: 'center' }}>
{/* <View style={{ marginRight: 15, marginLeft: 15, paddingVertical: 5, flex: 0.5 }}>
<Button title="Clear Filters" />
</View> */}
<View style={{ marginRight: 15, marginLeft: 15, paddingVertical: 5, flex: 0.5 }}>
<TouchableOpacity style={styles.btnDRed} onPress={() => { navigation.goBack() }}>
<Text style={{ color: '#fff', fontWeight: 'bold', fontSize: 16 }}>APPLY</Text>
</TouchableOpacity>
</View>
</View>
</>
);
}
const styles = StyleSheet.create({
content: {
flexDirection: 'row',
flex: 1,
},
menuColumn: {
flex: .35,
flexDirection: 'column',
backgroundColor: '#dedede',
},
menuItem: {
// flex: 1,
flex: 0,
//height:hp(8.5),
justifyContent: 'center',
alignItems: 'center',
// alignItems: 'flex-start',
// borderWidth:1,
},
selectedMenuItem: {
backgroundColor: 'white',
color: '#162da2',
},
menuItemText: {
marginLeft: 10,
marginRight: 10,
alignSelf: 'flex-start',
fontSize: 15,
fontWeight: 'normal',
paddingVertical: 16,
},
// value column -right
settingsColumn: {
flex: .65,
padding: 10,
backgroundColor: 'white'
},
btnDRed: {
paddingVertical: 7,
alignItems: 'center',
borderRadius: 7,
backgroundColor: "#ff0000",
},
});
export default Filter;
【问题讨论】：
标签： javascript react-native react-hooks use-state react-state