1. 应用场景
开发中经常遇到
- 路由跳转时拿不到context怎么办，eg: token失效/异地登录跳转登录页面。
- 获取不到当前路由名称怎么办，eg: 点击push推送跳转指定路由，如果已经在当前页面就replace，如果不在就push。
- 注册监听路由跳转,做一些想做的事情 ，eg：不同路由，显示不同状态栏颜色。
- 等等…
2. 解决方案
解决思路：
- MaterialApp 的routes属性赋值路由数组，navigatorObservers属性赋值路由监听对象NavigatorManager。
- 在NavigatorManager里实现NavigatorObserver的didPush/didReplace/didPop/didRemove，并记录到路由栈List _mRoutes中。
- 将实时记录的路由跳转，用stream发一个广播，哪里需要哪里注册。
3. 具体实现
main.dart
代码语言：javascript复制MaterialApp(
navigatorObservers: [NavigatorManager.getInstance()],
routes: NavigatorManager.configRoutes,
...
)navigator_manager.dart
代码语言：javascript复制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(),
//...
}
// 当前路由栈
static List<Route _mRoutes;
List<Route get routes = _mRoutes;
// 当前路由
Route get currentRoute = _mRoutes[_mRoutes.length - 1];
// stream相关
static StreamController _streamController;
StreamController get streamController= _streamController;
// 用来路由跳转
static NavigatorState navigator;
/* 单例给出NavigatorManager */
static NavigatorManager navigatorManager;
static NavigatorManager getInstance() {
if (navigatorManager == null) {
navigatorManager = new NavigatorManager();
_streamController = StreamController.broadcast();
}
return navigatorManager;
}
// replace 页面
pushReplacementNamed(String routeName, [WidgetBuilder builder]) {
return navigator.pushReplacement(
CupertinoPageRoute(
builder: builder ?? configRoutes[routeName],
settings: RouteSettings(name: routeName),
),
);
}
// push 页面
pushNamed(String routeName, [WidgetBuilder builder]) {
return navigator.push(
CupertinoPageRoute(
builder: builder ?? configRoutes[routeName],
settings: RouteSettings(name: routeName),
),
);
}
// pop 页面
pop<T extends Object ([T result]) {
navigator.pop(result);
}
// push一个页面， 移除该页面下面所有页面
pushNamedAndRemoveUntil(String newRouteName) {
return navigator.pushNamedAndRemoveUntil(newRouteName, (Route<dynamic route) = false);
}
// 当调用Navigator.push时回调
@override
void didPush(Route route, Route previousRoute) {
super.didPush(route, previousRoute);
if (_mRoutes == null) {
_mRoutes = new List<Route ();
}
// 这里过滤调push的是dialog的情况
if (route is CupertinoPageRoute || route is MaterialPageRoute) {
_mRoutes.add(route);
routeObserver();
}
}
// 当调用Navigator.replace时回调
@override
void didReplace({Route newRoute, Route oldRoute}) {
super.didReplace();
if (newRoute is CupertinoPageRoute || newRoute is MaterialPageRoute) {
_mRoutes.remove(oldRoute);
_mRoutes.add(newRoute);
routeObserver();
}
}
// 当调用Navigator.pop时回调
@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, '&&路由栈&&');
LogUtil.i(sName, _mRoutes);
LogUtil.i(sName, '&&当前路由&&');
LogUtil.i(sName, _mRoutes[_mRoutes.length - 1]);
// 当前页面的navigator，用来路由跳转
navigator = _mRoutes[_mRoutes.length - 1].navigator;
streamController.sink.add(_mRoutes);
}
}4. 如何使用
token失效跳转
代码语言：javascript复制case 401:
ToastUtil.showRed('登录失效,请重新登陆');
UserDao.clearAll();
NavigatorManager.getInstance().pushNamedAndRemoveUntil(LoginPage.sName);
break;点击push推送跳转
代码语言：javascript复制static jumpPage(String pageName, [WidgetBuilder builder]) {
String currentRouteName = NavigatorManager.getInstance().currentRoute.settings.name;
// 如果是未登录，不跳转
if (NavigatorManager.getInstance().routes[0].settings.name != MainPage.sName) {
return;
}
// 如果已经是当前页面就replace
if (currentRouteName == pageName) {
NavigatorManager.getInstance().pushReplacementNamed(pageName, builder);
} else {
NavigatorManager.getInstance().pushNamed(pageName, builder);
}
}监听路由改变状态栏颜色
代码语言：javascript复制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();
}
}
}完结，撒花
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对ZaLou.Cn的支持。
