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本篇主要来详细介绍如何安装、升级插件及讲解一个react-native-tab-navigator的示例。
首先推荐一个插件网站:https://www.npmjs.com (此插件属于半官方维护的)
本文举例使用的插件:react-native-tab-navigator ,选项卡形式的导航
1. 通过 https://www.npmjs.com 找到我们想使用的插件, 搜索:react-native-tab-navigator
2. 我们可以看到插件介绍页面有详细的介绍,以及如何安装也有介绍,如下图:
图中红色框选的是插件在github的源码页面地址~
3. 下面对项目进行安装此插件:
3.1 打开终端,cd 到项目根路径
3.2 使用命令:npm install react-native-tab-navigator –save
3.3 安装成功后,你会在项目下的package.json文件内dependencies下看到(如下图):
新增加了一条:”react-native-tab-navigator”: “^0.3.2”
4. 更新插件的两种方式方式(上):
4.1: 打开终端,cd 到目标项目根路径
4.2 使用命令: npm install xxx@yyy –save –registry zzz
–save记录版本到项目的package.json下留底(一般最好都带上)
–registry
xxx@yyy: @符号前是 插件名,@符号后是插件目标版本号
(如果目标版本号yyy填:latest 表示该插件的最新版本)
zzz:制定的镜像源地址
这里举例:
npm install react-native-tab-navigator@latest –save
更新react-native-tab-navigator插件到最新 ,且将版本号记录到项目的json文件中。
4. 更新插件的两种方式方式(下):
4.1 :利用插件检查模块最新版本:npm-check-updates
4.2 : 安装到项目中,然后利用命令:ncu 进行查看版本,如下图:
5. 插件的使用:
5.1: 首先导入(使用node_modules下的模块,不需要路径):
import TabNavigator from 'react-native-tab-navigator' ; |
5.2 : 绘制代码段:
render ( ) { return ( . . . . . . < TabNavigator tabBarStyle = { styles . tab } > < TabNavigator . Item selected = { this . state . selectedTab === 'home' } title = "Home" renderIcon = { ( ) = > < Image source = { require ( './res/home_normal.png' ) } / > } renderSelectedIcon = { ( ) = > < Image source = { require ( './res/home_focus.png' ) } / > } badgeText = "61" onPress = { ( ) = > this . setState ( { selectedTab : 'home' } ) } >
< View style = { { flex : 1 , backgroundColor : '#fff' , justifyContent : 'center' } } > < Text style = { { fontSize : 20 } } >我是第一个选项卡,直接书写出的视图 ! < / Text > < / View >
< / TabNavigator . Item > < TabNavigator . Item selected = { this . state . selectedTab === 'profile' } title = "Profile" renderIcon = { ( ) = > < Image source = { require ( './res/personal_normal.png' ) } / > } renderSelectedIcon = { ( ) = > < Image source = { require ( './res/personal_focus.png' ) } / > } onPress = { ( ) = > this . setState ( { selectedTab : 'profile' } ) } >
< TestPage / >
< / TabNavigator . Item > < / TabNavigator > . . . . . . ) ; } |
TabNavigator.Item: 每个选项卡的组件名,其中属性解释:
selected:当前选项卡是否被选中
title: 标题
renderIcon:icon
renderSelectedIcon:被选中时的icon
badgeText:提示的角标数字
onPress:点击后事件响应函数
当选项卡被选中后,才会显示选项卡绘制的视图内容。
最后给出一个示例,两个文件:
Main.js
import React , { Component } from 'react' ; import { View , Text , StyleSheet , Image , } from 'react-native' ;
import TabNavigator from 'react-native-tab-navigator' ; import TestPage from './TestPage' ;
export default class Main extends Component { constructor ( props ) { super ( props ) ; this . state = { selectedTab : 'home' } ; }
render ( ) { return ( < View style = { { flex : 1 } } > < Text style = { styles . himiTextStyle } > Himi React Native 系列教程 < / Text > < TabNavigator tabBarStyle = { styles . tab } > < TabNavigator . Item selected = { this . state . selectedTab === 'home' } title = "Home" renderIcon = { ( ) = > < Image source = { require ( './res/home_normal.png' ) } / > } renderSelectedIcon = { ( ) = > < Image source = { require ( './res/home_focus.png' ) } / > } badgeText = "61" onPress = { ( ) = > this . setState ( { selectedTab : 'home' } ) } > < View style = { { flex : 1 , backgroundColor : '#fff' , justifyContent : 'center' } } > < Text style = { { fontSize : 20 } } >我是第一个选项卡,直接书写出的视图 ! < / Text > < / View > < / TabNavigator . Item >
< TabNavigator . Item selected = { this . state . selectedTab === 'profile' } title = "Profile" renderIcon = { ( ) = > < Image source = { require ( './res/personal_normal.png' ) } / > } renderSelectedIcon = { ( ) = > < Image source = { require ( './res/personal_focus.png' ) } / > } onPress = { ( ) = > this . setState ( { selectedTab : 'profile' } ) } > < TestPage / > < / TabNavigator . Item > < / TabNavigator > < / View > ) ; } } ;
var styles = StyleSheet . create ( { tab : { height : 100 , backgroundColor : '#eee' , alignItems : 'center' } , himiTextStyle : { backgroundColor : '#eee' , color : '#f00' , fontSize : 30 , marginTop : 30 , } , } ) ; |
TestPage.js
import React , { Component } from 'react' ; import { Text , View , } from 'react-native' ;
import TabNavigator from 'react-native-tab-navigator' ;
export default class TestPage extends Component { constructor ( props ) { super ( props ) ; this . state = { selectedTab : 'home' } ; }
render ( ) { return ( < View style = { { flex : 1 , backgroundColor : '#eee' , justifyContent : 'center' } } > < Text style = { { fontSize : 20 , color : '#f00' } } >我是 TestPage,导入使用的 ! < / Text > < / View > ) ; } } ; |
效果演示(点击查看动态图):