增加willPush 方法

example/lib/main.dart

@@ -37,6 +37,12 @@ class _MyAppState extends State<MyApp> {
       'f2f_second': (pageName, params, _) => F2FSecondPage(),
     });
     FlutterBoost.singleton.addBoostNavigatorObserver(TestBoostNavigatorObserver());
+    FlutterBoost.singleton.addContainerObserver((
+        ContainerOperation operation, BoostContainerSettings settings){
+      operation;
+      settings;
+    });
+
     FlutterBoostAPI.singleton.routeSettingsBuilder = (String url,
         {Map<String, dynamic> urlParams, Map<String, dynamic> exts}) => BoostRouteSettings(
       uniqueId: '${url}_${DateTime.now().millisecondsSinceEpoch}',
@@ -59,9 +65,13 @@ class _MyAppState extends State<MyApp> {
       String pageName, String uniqueId, Map params, Route route, Future _) {
   }
 }
-class TestBoostNavigatorObserver extends NavigatorObserver{
+
+class TestBoostNavigatorObserver extends ContainerNavigatorObserver{
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
+    route.settings.name!="/";
 
+    //1. 底下
+    //新页面已经push完成
     print("flutterboost#didPush");
   }
 
@@ -76,5 +86,10 @@ class TestBoostNavigatorObserver extends NavigatorObserver{
   void didReplace({Route<dynamic> newRoute, Route<dynamic> oldRoute}) {
     print("flutterboost#didReplace");
   }
+  void willPush(Route<dynamic> route, Route<dynamic> previousRoute) {
+
+    print("flutterboost#willPush");
+  }
+
 }
 

lib/container/boost_container.dart

@@ -227,6 +227,10 @@ class BoostContainerState extends NavigatorState {
           .prePushRoute(name, uniqueId, params, route);
     }
 
+    if (multipleRouteMode) {
+      ContainerNavigatorObserver.bindContainerManager().willPush(route, routerHistory.last);
+    }
+
     Future<T> future = super.push<T>(newRoute ?? route);
 
     routerHistory.add(route);
@@ -289,6 +293,14 @@ class ContainerNavigatorObserver extends NavigatorObserver {
     boostObservers.remove(observer);
   }
 
+  void willPush(Route<dynamic> route, Route<dynamic> previousRoute) {
+    for (NavigatorObserver observer in boostObservers) {
+      if(observer is ContainerNavigatorObserver){
+        ContainerNavigatorObserver  containerNavigatorObserver = observer as ContainerNavigatorObserver;
+        containerNavigatorObserver.willPush(route, previousRoute);
+      }
+    }
+  }
   @override
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
     for (NavigatorObserver observer in boostObservers) {

lib/flutter_boost.dart

@@ -77,7 +77,8 @@ class FlutterBoost {
               pageInfo["name"], pageInfo["params"], pageInfo["uniqueId"]);
         }
       });
-    });
+    }
+    );
   }
 
   static TransitionBuilder init({TransitionBuilder builder,
@@ -167,7 +168,7 @@ class FlutterBoost {
 
     final Route<Map<dynamic, dynamic>> route = routeBuilder != null
         ? routeBuilder(page)
-        : defaultRoute(page);
+        : defaultRoute(page,routeSettings);
 
     FlutterBoost.containerManager?.onstageContainer?.multipleRouteMode = true;
 
@@ -176,14 +177,17 @@ class FlutterBoost {
   }
 
 
-  Route<Map<dynamic, dynamic>> defaultRoute(Widget page) {
+  Route<Map<dynamic, dynamic>> defaultRoute(Widget page,BoostRouteSettings settings ) {
+    RouteSettings routeSettings =new RouteSettings(name:settings.name,arguments:settings.params);
     if (Platform.isIOS) {
       return CupertinoPageRoute<Map<dynamic, dynamic>> (
+        settings: routeSettings,
         builder: (BuildContext context) => page
       );
     }
     return PageRouteBuilder(
         transitionDuration: Duration(milliseconds: 300),
+        settings:routeSettings ,
         pageBuilder: (context, animation, secondaryAnimation) => page,
         transitionsBuilder: (context, animation, secondaryAnimation, child) {
           var offsetAnimation = Tween<Offset>(