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Flutter上線項(xiàng)目實(shí)戰(zhàn)記錄之路由篇

更新時(shí)間：2019年09月06日 14:20:12 作者：callme大帥

這篇文章主要給大家介紹了關(guān)于Flutter上線項(xiàng)目實(shí)戰(zhàn)記錄之路由篇的相關(guān)資料，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家學(xué)習(xí)或者使用Flutter具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面來一起學(xué)習(xí)學(xué)習(xí)吧

1. 應(yīng)用場(chǎng)景

開發(fā)中經(jīng)常遇到

路由跳轉(zhuǎn)時(shí)拿不到context怎么辦，eg: token失效/異地登錄跳轉(zhuǎn)登錄頁面。
獲取不到當(dāng)前路由名稱怎么辦，eg: 點(diǎn)擊push推送跳轉(zhuǎn)指定路由，如果已經(jīng)在當(dāng)前頁面就replace，如果不在就push。
注冊(cè)監(jiān)聽路由跳轉(zhuǎn),做一些想做的事情，eg：不同路由，顯示不同狀態(tài)欄顏色。
等等...

2. 解決方案

解決思路：

MaterialApp 的routes屬性賦值路由數(shù)組，navigatorObservers屬性賦值路由監(jiān)聽對(duì)象NavigatorManager。
在NavigatorManager里實(shí)現(xiàn)NavigatorObserver的didPush/didReplace/didPop/didRemove，并記錄到路由棧List _mRoutes中。
將實(shí)時(shí)記錄的路由跳轉(zhuǎn)，用stream發(fā)一個(gè)廣播，哪里需要哪里注冊(cè)。

3. 具體實(shí)現(xiàn)

main.dart

MaterialApp(
 navigatorObservers: [NavigatorManager.getInstance()],
 routes: NavigatorManager.configRoutes,
 ...
)

navigator_manager.dart

class NavigatorManager extends NavigatorObserver {
 /* 配置routes */
 static Map<String, WidgetBuilder> configRoutes = {
 PackageInfoPage.sName: (context) =>
 SplashPage.sName: (context) => SplashPage(),
 LoginPage.sName: (context) => SplashPage()),
 MainPage.sName: (context) => SplashPage(),
 //...
 }
 // 當(dāng)前路由棧
 static List<Route> _mRoutes;
 List<Route> get routes => _mRoutes;
 // 當(dāng)前路由
 Route get currentRoute => _mRoutes[_mRoutes.length - 1];
 // stream相關(guān)
 static StreamController _streamController;
 StreamController get streamController=> _streamController;
 // 用來路由跳轉(zhuǎn)
 static NavigatorState navigator;
 
 /* 單例給出NavigatorManager */
 static NavigatorManager navigatorManager;
 static NavigatorManager getInstance() {
 if (navigatorManager == null) {
  navigatorManager = new NavigatorManager();
  _streamController = StreamController.broadcast();
 }
 return navigatorManager;
 }
 
 // replace 頁面
 pushReplacementNamed(String routeName, [WidgetBuilder builder]) {
 return navigator.pushReplacement(
  CupertinoPageRoute(
  builder: builder ?? configRoutes[routeName],
  settings: RouteSettings(name: routeName),
  ),
 );
 }
 
 // push 頁面
 pushNamed(String routeName, [WidgetBuilder builder]) {
 return navigator.push(
  CupertinoPageRoute(
  builder: builder ?? configRoutes[routeName],
  settings: RouteSettings(name: routeName),
  ),
 );
 }
 
 // pop 頁面
 pop<T extends Object>([T result]) {
 navigator.pop(result);
 }
 
 // push一個(gè)頁面， 移除該頁面下面所有頁面
 pushNamedAndRemoveUntil(String newRouteName) {
 return navigator.pushNamedAndRemoveUntil(newRouteName, (Route<dynamic> route) => false);
 }
 
 // 當(dāng)調(diào)用Navigator.push時(shí)回調(diào)
 @override
 void didPush(Route route, Route previousRoute) {
 super.didPush(route, previousRoute);
 if (_mRoutes == null) {
  _mRoutes = new List<Route>();
 }
 // 這里過濾調(diào)push的是dialog的情況
 if (route is CupertinoPageRoute || route is MaterialPageRoute) {
  _mRoutes.add(route);
  routeObserver();
 }
 }
 
 // 當(dāng)調(diào)用Navigator.replace時(shí)回調(diào)
 @override
 void didReplace({Route newRoute, Route oldRoute}) {
 super.didReplace();
 if (newRoute is CupertinoPageRoute || newRoute is MaterialPageRoute) {
  _mRoutes.remove(oldRoute);
  _mRoutes.add(newRoute);
  routeObserver();
 }
 }
 
 // 當(dāng)調(diào)用Navigator.pop時(shí)回調(diào)
 @override
 void didPop(Route route, Route previousRoute) {
 super.didPop(route, previousRoute);
 if (route is CupertinoPageRoute || route is MaterialPageRoute) {
  _mRoutes.remove(route);
  routeObserver();
 }
 }
 
 @override
 void didRemove(Route removedRoute, Route oldRoute) {
 super.didRemove(removedRoute, oldRoute);
 if (removedRoute is CupertinoPageRoute || removedRoute is MaterialPageRoute) {
  _mRoutes.remove(removedRoute);
  routeObserver();
 }
 }
 
 void routeObserver() {
 LogUtil.i(sName, '&&路由棧&&');
 LogUtil.i(sName, _mRoutes);
 LogUtil.i(sName, '&&當(dāng)前路由&&');
 LogUtil.i(sName, _mRoutes[_mRoutes.length - 1]);
 // 當(dāng)前頁面的navigator，用來路由跳轉(zhuǎn)
 navigator = _mRoutes[_mRoutes.length - 1].navigator;
 streamController.sink.add(_mRoutes);
 }
}

4. 如何使用

token失效跳轉(zhuǎn)

case 401:
  ToastUtil.showRed('登錄失效,請(qǐng)重新登陸');
  UserDao.clearAll();
  NavigatorManager.getInstance().pushNamedAndRemoveUntil(LoginPage.sName);
  break;

點(diǎn)擊push推送跳轉(zhuǎn)

static jumpPage(String pageName, [WidgetBuilder builder]) {
  String currentRouteName = NavigatorManager.getInstance().currentRoute.settings.name;
  // 如果是未登錄，不跳轉(zhuǎn)
  if (NavigatorManager.getInstance().routes[0].settings.name != MainPage.sName) {
   return;
  }

  // 如果已經(jīng)是當(dāng)前頁面就replace
  if (currentRouteName == pageName) {
   NavigatorManager.getInstance().pushReplacementNamed(pageName, builder);
  } else {
   NavigatorManager.getInstance().pushNamed(pageName, builder);
  }
}

監(jiān)聽路由改變狀態(tài)欄顏色

class StatusBarUtil {
   static List<String> lightRouteNameList = [
    TaskhallPage.sName,
    //...
   ];
   static List darkRoutNameList = [
    SplashPage.sName,
    LoginPage.sName,
    MainPage.sName,
    //...
   ];
   
   static init() {
    NavigatorManager.getInstance().streamController.stream.listen((state) {
      setupStatusBar(state[state.length - 1]);
    })
   }
  
   setupStatusBar(Route currentRoute) {
    if (lightRouteNameList.contains(currentRoute.settings.name)) {
     setLight();
    } else if (darkRoutNameList.contains(currentRoute.settings.name)) {
     setDart();
    }
   }
}

完結(jié)，撒花🎉

總結(jié)

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