[breaking change]PageVisibility不再提供create和destroy方法,删除无用example_swift (…

…#1177)

* [breaking]PageVisibility不再提供create和destroy方法，业务将在initState和dispose，复用Widget原有能力，删除无用example_swift

* 更改全局路由监听器函数名称，使其更符合flutter内部语义

example/lib/main.dart

@@ -21,7 +21,7 @@ void main() {
 
 class AppGlobalPageVisibilityObserver extends GlobalPageVisibilityObserver {
   @override
-  void onPageCreate(Route<dynamic> route) {
+  void onPagePush(Route<dynamic> route) {
     Logger.log(
         'boost_lifecycle: AppGlobalPageVisibilityObserver.onPageCreate route:${route.settings.name}');
   }
@@ -39,7 +39,7 @@ class AppGlobalPageVisibilityObserver extends GlobalPageVisibilityObserver {
   }
 
   @override
-  void onPageDestroy(Route<dynamic> route) {
+  void onPagePop(Route<dynamic> route) {
     Logger.log(
         'boost_lifecycle: AppGlobalPageVisibilityObserver.onPageDestroy route:${route.settings.name}');
   }

example3.0/lib/pages/lifecycle_test_page.dart

@@ -17,15 +17,15 @@ class AppLifecycleObserver with GlobalPageVisibilityObserver {
   }
 
   @override
-  void onPageCreate(Route route) {
-    super.onPageCreate(route);
-    print("AppLifecycleObserver - onPageCreate");
+  void onPagePush(Route route) {
+    super.onPagePush(route);
+    print("AppLifecycleObserver - onPagePush");
   }
 
   @override
-  void onPageDestroy(Route route) {
-    super.onPageDestroy(route);
-    print("AppLifecycleObserver - onPageDestroy");
+  void onPagePop(Route route) {
+    super.onPagePop(route);
+    print("AppLifecycleObserver - onPagePop");
   }
 
   @override
@@ -63,18 +63,6 @@ class _LifecycleTestPageState extends State<LifecycleTestPage>
     print("LifecycleTestPage - onForeground");
   }
 
-  @override
-  void onPageCreate() {
-    super.onPageCreate();
-    print("LifecycleTestPage - onPageCreate");
-  }
-
-  @override
-  void onPageDestroy() {
-    super.onPageDestroy();
-    print("LifecycleTestPage - onPageDestroy");
-  }
-
   @override
   void onPageHide() {
     super.onPageHide();