fix: _children has not been initialized exception

flutter-thrio · Mar 27, 2024 · 63c1a0e · 63c1a0e
1 parent 1d06a11
commit 63c1a0e
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.9.2
+
+- fix: _children has not been initialized exception
+
 ## 4.9.1
 
 - fix: NavigatorRoute type cast error in NavigatorObserverManager.didRemove

diff --git a/lib/src/navigator/navigator_page_view.dart b/lib/src/navigator/navigator_page_view.dart
@@ -84,9 +84,9 @@ class NavigatorPageView extends StatefulWidget {
 
   final bool padEnds;
 
-  late List<Widget> _children;
+  List<Widget>? _children;
 
-  List<Widget> get children => _children;
+  List<Widget>? get children => _children;
 
   @override
   State<NavigatorPageView> createState() => _NavigatorPageViewState();

diff --git a/lib/src/navigator/navigator_tab_bar_view.dart b/lib/src/navigator/navigator_tab_bar_view.dart
@@ -189,8 +189,11 @@ class _NavigatorTabBarViewState extends State<NavigatorTabBarView> {
   }
 
   void _updateChildren() {
-    if (pv != null) {
-      _childrenWithKey = KeyedSubtree.ensureUniqueKeysForList(pv!.children);
+    if (pv != null && pv?.children != null) {
+      _childrenWithKey = KeyedSubtree.ensureUniqueKeysForList(pv!.children!);
+    } else {
+      // 尽可能早的初始化
+      Future.delayed(const Duration(milliseconds: 10), _updateChildren);
     }
   }
 

diff --git a/pubspec.yaml b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_thrio
 description: Thrio makes it easy and fast to add flutter to existing mobile applications, and provide a simple and consistent navigator APIs.
-version: 4.9.1
+version: 4.9.2
 homepage: https://github.com/flutter-thrio/flutter_thrio
 
 environment: