我正在尝试通过路线从一个屏幕导航到另一个屏幕。当我点击页面上的按钮以移动到所提供的路线时,我得到了错误
I/flutter ( 8790): Another exception was thrown: There are multiple heroes that share the same tag within a subtree.
这是代码:
路线:
<String, WidgetBuilder>{ '/first':(BuildContext context) =>NavigatorOne() , '/second':(BuildContext context) =>NavigatorTwo(), '/third':(BuildContext context) =>NavigatorThree(), }, Navigator.of(context).pushNamed('/first'); Navigator.of(context).pushNamed('/second'); Navigator.of(context).pushNamed('/third'); class NavigatorOne extends StatefulWidget { @override _NavigatorOneState createState() => _NavigatorOneState(); } class _NavigatorOneState extends State<NavigatorOne> { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(), body: Container( color: Colors.green, child: RaisedButton(child: Text(' one 1'),onPressed: (){ Navigator.of(context).pushNamed('/second'); },), ), ); } }
错误:
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter (21786): The following assertion was thrown during a scheduler callback: I/flutter (21786): There are multiple heroes that share the same tag within a subtree. I/flutter (21786): Within each subtree for which heroes are to be animated (typically a PageRoute subtree), each Hero I/flutter (21786): must have a unique non-null tag. I/flutter (21786): In this case, multiple heroes had the following tag: <default FloatingActionButton tag>
我该如何解决?
我之前遇到过这种情况,这是因为我FloatingAction在一个屏幕上有两个按钮,所以我必须添加一个heroTag属性+每个值FloatingActionButton,以消除错误。
FloatingAction
FloatingActionButton
例:
new FloatingActionButton( heroTag: "btn1", ... ) new FloatingActionButton( heroTag: "btn2", ... )
从您提供的示例代码来看,您似乎没有FloatingActionButton,但是从错误中似乎确实引用了它:
I/flutter (21786): In this case, multiple heroes had the following tag: default FloatingActionButton tag
也许您在导航页面上使用了它,然后触发了错误。请注意,如果您使用编程方式创建带标签的英雄,则需要找到一种为他们赋予不同标签的方法。例如,如果您正在ListView.builder()创建FloatingActionButtons,请尝试传递带有字符串格式的标签,以便每个按钮具有不同的标签,例如:heroTag: "btn$index"。
ListView.builder()
FloatingActionButtons
heroTag: "btn$index"
无论如何,希望能对某人有所帮助。