如何解决底部导航栏停止工作 ScrollController 附加到多个滚动视图 pagecontroller.jumpTo 错误
'package:Flutter/src/widgets/scroll_controller.dart':断言失败:第 113 行 pos 12:'_positions.length == 1':ScrollController 附加到多个滚动视图。
PageController pageController;
class MainController extends StatefulWidget {
@override
_MainControllerState createState() => _MainControllerState();
}
class _MainControllerState extends State<MainController>
with TickerProviderStateMixin {
@override
void initState() {
// Todo: implement initState
super.initState();
pageController = PageController(initialPage: 0,keepPage: true);
}
@override
void dispose() {
// Todo: implement dispose
super.dispose();
pageController.dispose();
}
PagesList() {
return BlocBuilder<BottomnavbarcubitCubit,BottomnavbarcubitState>(
builder: (context,state) {
return Scaffold(
body: PageView(
allowImplicitScrolling: true,controller: pageController,onPageChanged: (int index) => state.currentIndex = index,children: [
NotificationsScreen(),NotificationsScreen(),],),bottomNavigationBar: normalNavBar(),);
},);
}
}
try {
if (pageController.hasClients)
await pageController.animatetoPage(state.currentIndex,duration: Duration(milliseconds: 500),curve: Curves.elasticOut);
} catch (err) {
print(err);
}
E/Flutter (30081): #18 GestureBinding._handlePointerEvent
package:Flutter/…/gestures/binding.dart:295
E/Flutter (30081): #19 GestureBinding._flushPointerEventQueue
package:Flutter/…/gestures/binding.dart:240
E/Flutter (30081): #20 GestureBinding._handlePointerDataPacket
package:Flutter/…/gestures/binding.dart:213
E/Flutter (30081): #21 _rootRunUnary (dart:async/zone.dart:1206:13)
E/Flutter (30081): #22 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/Flutter (30081): #23 _CustomZone.runUnaryguarded (dart:async/zone.dart:1005:7)
E/Flutter (30081): #24 _invoke1 (dart:ui/hooks.dart:265:10)
E/Flutter (30081): #25 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
解决方法
当从 firestore 获取数据被取消时发生。然后底部导航栏在重新启动应用程序之前不起作用。
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