搭建react-native項(xiàng)目框架 — 集成第三方路由和tab頁的功能實(shí)現(xiàn)
[導(dǎo)讀]先來看下效果：這里需要用到兩個第三方插件：react-native-router-flux?路由，https://github.com/aksonov/react-native-router-flux
先來看下效果：
這里需要用到兩個第三方插件：
react-native-router-flux?路由，https://github.com/aksonov/react-native-router-flux
react-native-scrollable-tab-view 選項(xiàng)卡，https://github.com/skv-headless/react-native-scrollable-tab-view
prop-types?類型檢測庫
閱讀官方文檔，安裝這三個插件
$?npm?install?react-native-router-flux?--save
$?npm?install?react-native-scrollable-tab-view?--save
$?npm?install?prop-types?--save
在App.js中引入插件
import?{?Router,?Scene?}?from?'react-native-router-flux';
import?ScrollableTabView?from?'react-native-scrollable-tab-view';在工作目錄下創(chuàng)建components文件夾，并添加customTabBar.js文件作為tab欄，如下
import?React,?{Component}?from?'react';
import?{
????Platform,
????StyleSheet,
????StatusBar,
????View,
????TouchableOpacity,
????Image,
????Text,
}?from?'react-native';
//第三方插件
import?PropTypes?from?'prop-types';
//自定義組件
import?Common?from?'./common';?//公共類
const?tabIcons?=?[
????require('../resources/images/tabs/home_v.png'),
????require('../resources/images/tabs/home_x.png'),
????require('../resources/images/tabs/headset_v.png'),
????require('../resources/images/tabs/headset_x.png'),
????require('../resources/images/tabs/bought_v.png'),
????require('../resources/images/tabs/bought_x.png'),
????require('../resources/images/tabs/mine_v.png'),
????require('../resources/images/tabs/mine_x.png')
];
export?default?class?CustomTabBar?extends?Component?{
????constructor(props)?{
????????super(props);
????}
????static?setAnimationValue({value})?{
????????console.log(value);
????}
????componentDidMount()?{
????????//?Animated.Value監(jiān)聽范圍?[0,?tab數(shù)量-1]
????????this.props.scrollValue.addListener(CustomTabBar.setAnimationValue);
????}
????renderTabOption(tab,?i)?{
????????let?color?=?this.props.activeTab?===?i???"#1296db"?:?"#707070";?//?判斷i是否是當(dāng)前選中的tab，設(shè)置不同的顏色
????????let?tabName?=?this.props.tabNames[i];
????????return?(this.props.goToPage(i)}?style={[styles.tab]}?key={'tab'?+?i}>{tabName});
????}
????renderTabs()?{
????????if?(true?!==?this.props.placeMiddle?||?0?!==?this.props.tabs.length%2)?{
????????????return?this.props.tabs.map((tab,?i)?=>?this.renderTabOption(tab,?i));
????????}?else??{
????????????let?tabs?=?[];
????????????for?(let?i?=?0;?i?<?this.props.tabs.length;?i++)?{
????????????????let?tab?=?this.props.tabs[i];
????????????????if?(i?===?parseInt(this.props.tabs.length/2))?{
????????????????????let?middle?=?();
????????????????????tabs.push(middle);
????????????????}
????????????????tabs.push(this.renderTabOption(tab,?i));
????????????}
????????????return?tabs;
????????}
????}
????render()?{
????????let?tabBarHeight?=?Platform.select({
????????????ios:?Common.isIphoneX???68?:?49,
????????????android:?49,
????????});
????????return?({this.renderTabs()});
????}
}
CustomTabBar.propTypes?=?{
????goToPage:?PropTypes.func,?//?跳轉(zhuǎn)到對應(yīng)tab的方法
????activeTab:?PropTypes.number,?//?當(dāng)前被選中的tab下標(biāo)
????tabs:?PropTypes.array,?//?所有tabs集合
????tabNames:?PropTypes.array,?//?保存Tab名稱
????tabIconNames:?PropTypes.array,?//?保存Tab圖標(biāo)
};
const?styles?=?StyleSheet.create({
????tabs:?{
????????flexDirection:?'row',
????????backgroundColor:'#ffffff',
????????borderTopWidth:?0.5,
????????borderTopColor:?'#cdcdcd',
????},
????tab:?{
????????flex:?1,
????????flexDirection:?'column',
????????justifyContent:?'center',
????????alignItems:?'center',
????},
????tabBox:?{
????????flexDirection:?'column',
????????justifyContent:?'center',
????????alignItems:?'center',
????????width:?48,
????????height:?48,
????},
????tabMiddleBox:?{
????????flex:?1,
????????flexDirection:?'column',
????????justifyContent:?'center',
????????alignItems:?'center',
????????width:?48,
????????height:?48,
????},
????tabBoxIcon:?{
????????width:?22,
????????height:?22,
????},
????tabBoxName:?{
????????fontSize:?10,
????????marginTop:?3,
????},
});這里用到了一個公共類common.js
import?{
????Dimensions,
????PixelRatio,
????Platform
}?from?'react-native';
export?let?screenWidth?=?Dimensions.get('window').width;
export?let?screenHeight?=?Dimensions.get('window').height;
export?let?fontScale?=?PixelRatio.getFontScale();
export?let?pixelRatio?=?PixelRatio.get();
//像素密度
export?const?DEFAULT_DENSITY?=?2;
//px轉(zhuǎn)換成dp
//以iphone6為基準(zhǔn),如果以其他尺寸為基準(zhǔn)的話,請修改下面的750和1334為對應(yīng)尺寸即可.
const?width2x?=?750?/?DEFAULT_DENSITY;
//px轉(zhuǎn)換成dp
const?height2x?=?1334?/?DEFAULT_DENSITY;
//?iPhoneX
const?X_WIDTH?=?375;
const?X_HEIGHT?=?812;
/**
?*?設(shè)置字體的size（單位px）
?*?@param?size?傳入設(shè)計(jì)稿上的px
?*?@returns?{Number}?返回實(shí)際sp
?*/
export?function?autoFontSize(size)?{
????let?scaleWidth?=?screenWidth?/?width2x;
????let?scaleHeight?=?screenHeight?/?height2x;
????let?scale?=?Math.min(scaleWidth,?scaleHeight);
????size?=?Math.round((size?*?scale?+?0.5));
????return?size?/?DEFAULT_DENSITY;
}
/**
?*?屏幕適配,縮放size
?*?@param?size
?*?@returns?{Number}
?*/
export?function?autoScaleSize(size)?{
????let?scaleWidth?=?screenWidth?/?width2x;
????let?scaleHeight?=?screenHeight?/?height2x;
????let?scale?=?Math.min(scaleWidth,?scaleHeight);
????size?=?Math.round((size?*?scale?+?0.5));
????return?size?/?DEFAULT_DENSITY;
}
/**
?*?判斷是否為iphoneX
?*?@returns?{boolean}
?*/
export?function?isIphoneX()?{
????return?(
????????Platform.OS?===?'ios'?&&
????????((screenHeight?===?X_HEIGHT?&&?screenWidth?===?X_WIDTH)?||
????????(screenHeight?===?X_WIDTH?&&?screenWidth?===?X_HEIGHT))
????)
}
Date.prototype.format=function(fmt)?{
????let?o?=?{
????????"M+"?:?this.getMonth()+1,?//月份
????????"d+"?:?this.getDate(),?//日
????????"h+"?:?this.getHours()%12?===?0???12?:?this.getHours()%12,?//小時
????????"H+"?:?this.getHours(),?//小時
????????"m+"?:?this.getMinutes(),?//分
????????"s+"?:?this.getSeconds(),?//秒
????????"q+"?:?Math.floor((this.getMonth()+3)/3),?//季度
????????"S"?:?this.getMilliseconds()?//毫秒
????};
????let?weekday?=?{
????????"0"?:?"/u65e5",
????????"1"?:?"/u4e00",
????????"2"?:?"/u4e8c",
????????"3"?:?"/u4e09",
????????"4"?:?"/u56db",
????????"5"?:?"/u4e94",
????????"6"?:?"/u516d"
????};
????if(/(y+)/.test(fmt)){
????????fmt=fmt.replace(RegExp.$1,?(this.getFullYear()+"").substr(4?-?RegExp.$1.length));
????}
????if(/(E+)/.test(fmt)){
????????fmt=fmt.replace(RegExp.$1,?((RegExp.$1.length>1)???(RegExp.$1.length>2???"/u661f/u671f"?:?"/u5468")?:?"")+weekday[this.getDay()+""]);
????}
????for(let?k?in?o){
????????if(new?RegExp("("+?k?+")").test(fmt)){
????????????fmt?=?fmt.replace(RegExp.$1,?(RegExp.$1.length===1)???(o[k])?:?(("00"+?o[k]).substr((""+?o[k]).length)));
????????}
????}
????return?fmt;
};
export?default?class?Common?{
????static?SCREEN_WIDTH?=?screenWidth;
????static?SCREEN_HEIGHT?=?screenHeight;
????static?PIXEL_RATIO?=?pixelRatio;
????static?DEFAULT_DENSITY?=?DEFAULT_DENSITY;
????//是否為iphoneX
????static?isIphoneX?=?isIphoneX();
????//字體自適應(yīng)大小
????static?autoFontSize(size)?{
????????return?autoFontSize(size);
????}
????//尺寸自適應(yīng)大小
????static?autoScaleSize(size)?{
????????return?autoScaleSize(size);
????}
????//獲取指定格式時間字符串
????static?getDateFormat(date,?format?=?false)?{
????????if?(false?!==?format)?{
????????????format?=?"yyyy-MM-dd?HH:mm:ss";
????????}
????????return?date.format(format);
????}
}然后在App.js內(nèi)渲染路由和tab，注意在路由外層要包一個View，以便后面我們使用全局的toast和loading，同時tab作為路由中的一個頁整體呈現(xiàn)。
//自定義組件
import?CustomTabBar?from?'./components/customTabBar';?//自定義選項(xiàng)卡
//選項(xiàng)卡Tab頁
import?HomeTabScreen?from?'./views/home';?//首頁
import?HeadsetTabScreen?from?'./views/headset';?//試聽
import?BoughtTabScreen?from?'./views/bought';?//已購
import?MineTabScreen?from?'./views/mine';?//我的
//頁面
import?SignInOrUpScreen?from?'./views/signIns/signInOrUp';?//免注冊登錄
import?SignInScreen?from?'./views/signIns/signIn';?//登錄
//?const?instructions?=?Platform.select({
//???ios:?'Press?Cmd+R?to?reload,n'?+
//?????'Cmd+D?or?shake?for?dev?menu',
//???android:?'Double?tap?R?on?your?keyboard?to?reload,n'?+
//?????'Shake?or?press?menu?button?for?dev?menu',
//?});
export?class?Tabs?extends?Component?{
????constructor(props)?{
????????super(props);
????}
????componentWillMount()?{
????????//?Disable?back?button?by?just?returning?true?instead?of?Action.pop()
????????BackHandler.addEventListener('hardwareBackPress',?()?=>?{return?true});
????}
????render()?{
????????let?tabNames?=?['首頁',?'試聽',?'已購',?'我的'];
????????return?(}
????????????????tabBarPosition='bottom'
????????????>);
????}
}
export?default?class?App?extends?Component?{
????render()?{
????????return?({/*首頁(tab)*/}{/*登錄*/});
????}
}
const?styles?=?StyleSheet.create({
????router:?{
????????backgroundColor:?'#e6e6e6',
????},
????root:?{
????????backgroundColor:?'#e6e6e6',
????},
????title:?{
????????color:?'#ffffff',
????},
});這樣就把路由和tab集成到一起了，關(guān)于路由的使用這里有個詳解《react-native-router-flux使用技巧（API篇）》，我這里就說一些簡單的跳轉(zhuǎn)。
Actions.pop()
返回上一頁。
Actions.key()
不帶參跳轉(zhuǎn)到鍵為key的頁，Actions.key()中的key即為Scene的key屬性值，如代碼中的home和signInOrUp。
Actions.key(param)
帶參數(shù)跳轉(zhuǎn)到鍵為key的頁，Actions.key()中的key即為Scene的key屬性值，如代碼中的home和signInOrUp。
參數(shù)可以通過屬性獲取，如this.props.param。
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