react-native - 如何使用 FlatList 创建多个开关? [英] react-native - How to use FlatList to create multiple switches?
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问题描述
我想要一个包含多个开关的列表,以便为用户创建一个活动列表,然后选择/检查"他们是否对一个或多个感兴趣.
I want to have a list of multiple switches to essentially create a list of activities for the user to then "select/check" if they are interested in one or more.
我的计划是使用 switch 作为 Flatlist 的 renderItem,但我在两件事上遇到了麻烦.
My plan was to use a switch as the renderItem of a Flatlist, but I am having trouble with two things.
1) 当它在 Flatlist 中时,我无法让开关保持打开状态.我曾经让它工作过,但后来搞砸了.
1) I can't get the switch to stay toggled on when it is in the Flatlist. I had it working at one point but messed it up since.
2) 当它工作时,所有的开关会一起切换.
2) When it was working, all the switches would toggle together.
任何帮助将不胜感激!
import React, { Component } from 'react';
import { FlatList, StyleSheet, Text, View, Switch } from 'react-native';
class InterestsList extends Component {
constructor() {
listKeys = [
{key: 'Basketball'},
{key: 'Football'},
{key: 'Baseball'},
{key: 'Soccer'},
{key: 'Running'},
{key: 'Cross Training'},
{key: 'Gym Workout'},
{key: 'Swimming'},
];
super();
this.state = {
switchValue: false
}
}
toggleSwitch = (value) => {
this.setState({switchValue: value})
console.log('Switch is: ' + value)
}
listItem = ({item}) => (
<View style={{flex: 1, flexDirection: 'row', justifyContent: 'space-between'}}>
<Text style={styles.item}>{item.key}</Text>
<Switch
onValueChange={(value) => this.setState({switchValue: value})}
value={this.state.switchValue}
/>
</View>
);
render() {
return (
<FlatList
data={listKeys}
renderItem={this.listItem}
/>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: 22
},
item: {
padding: 10,
fontSize: 18,
height: 44,
},
})
export default InterestsList;
推荐答案
你可以试试这个:
import React, { Component } from 'react';
import { FlatList, StyleSheet, Text, View, Switch } from 'react-native';
class InterestsList extends Component {
constructor() {
super();
this.state = {
listKeys: [
{key: 'Basketball', switch : false},
{key: 'Football', switch : false},
{key: 'Baseball', switch : false},
{key: 'Soccer', switch : false},
{key: 'Running', switch : false},
{key: 'Cross Training', switch : false},
{key: 'Gym Workout', switch : false},
{key: 'Swimming', switch : false},
]
}
}
setSwitchValue = (val, ind) => {
const tempData = _.cloneDeep(this.state.listKeys);
tempData[ind].switch = val;
this.setState({ listKeys: tempData });
}
listItem = ({item, index}) => (
<View style={{flex: 1, flexDirection: 'row', justifyContent: 'space-between'}}>
<Text style={styles.item}>{item.key}</Text>
<Switch
onValueChange={(value) => this.setSwitchValue(value, index)}
value={item.switch}
/>
</View>
);
render() {
return (
<FlatList
data={this.state.listKeys}
renderItem={this.listItem}
/>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: 22
},
item: {
padding: 10,
fontSize: 18,
height: 44,
},
})
export default InterestsList;
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