如何使用native base ui套件在react native中以不同颜色显示列表中的选定项目

Question

我想用不同的背景色显示侧边栏内容。为此，我尝试了TouchableOpacity underlay。但那不是我想要的。给出TouchableOpacity后，它将只更改文本的颜色，而不是整个列表背景。如何在使用本机基本ui套件时更改列表项的背景颜色。请帮忙。有什么方法可以做到这一点吗？这就是侧边栏的样子。我做了如下的事情。在onPresList中将pressStatus设置为true，如果为true，则更改背景颜色。但导航到route不起作用。出现错误

https://i.stack.imgur.com/w9YiR.png

如何在Press上更改背景颜色？以下是我的代码。

更新

import React, { Component } from "react";
import { Image, FlatList } from "react-native";
import {
Content,
Text,
List,
ListItem,
Icon,
Container,
Left,
Right,
Badge,
Thumbnail
} from "native-base";
import styles from "./style";
const drawerCover = require("../../imgs/quwait.jpg");
const datas = [
{
name: "Dashboard",
route: "Anatomy",
icon: require("../../imgs/dashboard.png"),
},
{
name: "Companies",
route: "Header",
icon: require("../../imgs/enterprise1.png"),
},
{
name: "Company Admin",
route: "Footer",
icon: require("../../imgs/icon1.png"),
},
{
name: "Employee",
route: "NHBadge",
icon: require("../../imgs/businessman1.png"),
},
{
name: "Employs",
route: "NHButton",
icon: require("../../imgs/employee1.png"),
},
{
name: "Announcement",
route: "NHCard",
icon: require("../../imgs/megaphone1.png"),
},
{
name: "Holiday",
route: "Check",
icon:  require("../../imgs/sun-umbrella1.png"),
},
{
name: "Accounting Report",
route: "NHTypography",
icon: require("../../imgs/accounting1.png"),
},
{
name: "Invoice",
route: "NHCheckbox",
icon: require('../../imgs/approve-invoice1.png'),
},
{
name: "Settings",
route: "NHDatePicker",
icon: require('../../imgs/settings1.png'),
},
{
name: "Safety Phone Numbers",
route: "NHThumbnail",
icon: "user",
},
{
name: "NBK",
route: "NHDeckSwiper",
icon: "swap",
},
{
name: "ABK",
route: "NHFab",
icon: "help-buoy",
},
{
name: "CBK",
route: "NHForm",
icon: "call",
},
{
name: "Daily Invoice",
route: "NHIcon",
icon: "information-circle",
},
{
name: "Kolin",
route: "NHLayout",
icon: "grid",
},
{
name: "Limak",
route: "NHList",
icon: "lock",
},
{
name: "Polaytol",
route: "ListSwipe",
icon: "code-working",
},
{
name: "ACTS",
route: "NHPicker",
icon: "arrow-dropdown",
}
];
class SideBar extends Component {
constructor(props) {
super(props);
this.state = {
shadowOffsetWidth: 1,
shadowRadius: 4,
pressStatus:false
};
}
onPressList = (DATA, INDEX) => {
this.props.navigation.navigate(DATA.route);
this.setState({ pressStatus : true, selectedItem: INDEX});
}
render() {
return (
<Container>
<Content
bounces={false}
style={{ flex: 1, backgroundColor: "#fff", top: -1 }}
>
<Image source={drawerCover} style={styles.drawerCover} />
<FlatList
data={datas}
keyExtractor={(item, index) => String(index)}
renderItem={({ DATA, INDEX }) => {
<ListItem
button
noBorder
onPress={() => this.onPressList(DATA, INDEX)}
style={{
backgroundColor:
this.state.selectedItem === INDEX ? "#cde1f9" : "transparent"
}}
>
<Left>
<Image
source={DATA.icon }
style={{width:30,height:30}}
/>
<Text style={styles.text}>
{DATA.name}
</Text>
</Left>
</ListItem>}}
/>
</Content>
</Container>
);
}
}
export default SideBar;

Answer 1

在本机Base的应用程序示例中，它们不支持背景项列表的样式。因此，您应该从NativeBase更改List组件，并从react native添加一个FlatList组件。但您也应该从NativeBase返回ListItem组件，不要忘记import { FlatList } from "react-native";

您还应该修改onPressList函数(我会将其转换为箭头函数(

在您所在的州，您需要添加状态selectedItem: 0

每当你按下一个项目时，你的函数都会通过修改selectedItem idex来调用，它会告诉Flatlist哪个项目应该得到哪个背景。我认为这必须是解决方案。

如果它没有编译，请确保您支持箭头函数，并且没有丢失任何大括号或类似的东西。

最终代码更新

import React, { Component } from "react";
import { Image, FlatList } from "react-native";
import {
Content,
Text,
List,
ListItem,
Icon,
Container,
Left,
Right,
Badge,
Thumbnail
} from "native-base";
import styles from "./style";
const drawerCover = require("../../imgs/quwait.jpg");

const datas = [
{
name: "Dashboard",
route: "Anatomy",
icon: require("../../imgs/dashboard.png"),
},
{
name: "Companies",
route: "Header",
icon: require("../../imgs/enterprise1.png"),
},
{
name: "Company Admin",
route: "Footer",
icon: require("../../imgs/icon1.png"),
},
{
name: "Employee",
route: "NHBadge",
icon: require("../../imgs/businessman1.png"),
},
{
name: "Employs",
route: "NHButton",
icon: require("../../imgs/employee1.png"),
},
{
name: "Announcement",
route: "NHCard",
icon: require("../../imgs/megaphone1.png"),
},
{
name: "Holiday",
route: "Check",
icon:  require("../../imgs/sun-umbrella1.png"),
},
{
name: "Accounting Report",
route: "NHTypography",
icon: require("../../imgs/accounting1.png"),
},
{
name: "Invoice",
route: "NHCheckbox",
icon: require('../../imgs/approve-invoice1.png'),
},
{
name: "Settings",
route: "NHDatePicker",
icon: require('../../imgs/settings1.png'),
},
{
name: "Safety Phone Numbers",
route: "NHThumbnail",
icon: "user",
},
{
name: "NBK",
route: "NHDeckSwiper",
icon: "swap",

},
{
name: "ABK",
route: "NHFab",
icon: "help-buoy",
},
{
name: "CBK",
route: "NHForm",
icon: "call",
},
{
name: "Daily Invoice",
route: "NHIcon",
icon: "information-circle",
},
{
name: "Kolin",
route: "NHLayout",
icon: "grid",
},
{
name: "Limak",
route: "NHList",
icon: "lock",
},
{
name: "Polaytol",
route: "ListSwipe",
icon: "code-working",
},
{
name: "ACTS",
route: "NHPicker",
icon: "arrow-dropdown",
}
];
class SideBar extends Component {
constructor(props) {
super(props);
this.state = {
shadowOffsetWidth: 1,
shadowRadius: 4,
pressStatus:false,
selectedItem:0
};
}
onPressList = (data, index) => {
this.props.navigation.navigate(data.route);
this.setState({ pressStatus : true, selectedItem: index});
}
render() {
return (
<Container>
<Content
bounces={false}
style={{ flex: 1, backgroundColor: "#fff", top: -1 }}
>
<Image source={drawerCover} style={styles.drawerCover} />
<FlatList
data={datas}
keyExtractor={(item, index) => String(index)}
extraData={this.state.selectedItem}
renderItem={({item:data, index})  => {
const { selectedItem: sd } = this.state
const localColor ={backgroundColor: sd === index ? "#cde1f9" : "transparent"}
return (
<ListItem
button
noBorder
style={localColor}
onPress={() => this.onPressList(data, index)}                    
>
<Left>
<Image
source={data.icon}
style={{width:30,height:30}}
/>
<Text style={styles.text}>
{data.name}
</Text>
</Left>
</ListItem>
)                   
}}
/>
</Content>
</Container>
);
}
}
export default SideBar;