Merge pull request #622 from sundayman/master

解决iOS hot restart 白屏

ios/Classes/container/FLBFlutterViewContainer.m

@@ -179,11 +179,10 @@ static NSUInteger kInstanceCounter = 0;
                                               params:_params
                                             uniqueId:self.uniqueIDString];
     //Save some first time page info.
-    if(![FlutterBoostPlugin sharedInstance].fPagename){
-        [FlutterBoostPlugin sharedInstance].fPagename = _name;
-        [FlutterBoostPlugin sharedInstance].fPageId = self.uniqueIDString;
-        [FlutterBoostPlugin sharedInstance].fParams = _params;
-    }
+    [FlutterBoostPlugin sharedInstance].fPagename = _name;
+    [FlutterBoostPlugin sharedInstance].fPageId = self.uniqueIDString;
+    [FlutterBoostPlugin sharedInstance].fParams = _params;
+    
  
     [super viewWillAppear:animated];
     [self.view setNeedsLayout];

lib/flutter_boost.dart

@@ -55,23 +55,34 @@ class FlutterBoost {
   static ContainerManagerState get containerManager =>
       _instance.containerManagerKey.currentState;
 
+  static void onPageStart() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      singleton.channel.invokeMethod<Map>('pageOnStart').then((Map pageInfo) {
+        if (pageInfo == null || pageInfo.isEmpty) return;
+
+        if (pageInfo.containsKey("name") &&
+            pageInfo.containsKey("params") &&
+            pageInfo.containsKey("uniqueId")) {
+          ContainerCoordinator.singleton.nativeContainerDidShow(
+              pageInfo["name"], pageInfo["params"], pageInfo["uniqueId"]);
+        }
+      });
+    });
+  }
+
   static TransitionBuilder init(
       {TransitionBuilder builder,
       PrePushRoute prePush,
       PostPushRoute postPush}) {
     if (Platform.isAndroid) {
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        singleton.channel.invokeMethod<Map>('pageOnStart').then((Map pageInfo) {
-          if (pageInfo == null || pageInfo.isEmpty) return;
-
-          if (pageInfo.containsKey("name") &&
-              pageInfo.containsKey("params") &&
-              pageInfo.containsKey("uniqueId")) {
-            ContainerCoordinator.singleton.nativeContainerDidShow(
-                pageInfo["name"], pageInfo["params"], pageInfo["uniqueId"]);
-          }
-        });
-      });
+      onPageStart();
+    } else if (Platform.isIOS) {
+      assert(() {
+        () async {
+          onPageStart();
+        }();
+        return true;
+      }());
     }
 
     return (BuildContext context, Widget child) {