我正在调用InheritedWidget的函数,但是我的函数返回null,如上所示,我将我的小部件放在树的顶部.该调用来自一个被推入Navigator堆栈的页面,该页面不是此页面.谁知道为什么?我的InheritedWidget代码如下.
class LiveKHProvider extends InheritedWidget {
final LiveKHBloc liveKHBloc = LiveKHBloc();
@override
bool updateShouldNotify(InheritedWidget oldWidget) => oldWidget != this;
static LiveKHBloc of(BuildContext context) {
var inheritFromWidgetOfExactType =
context.inheritFromWidgetOfExactType(LiveKHProvider); // to clearly see what’s returning null.
//This is where it returns null,
//so the below line is executed on a null object.
return (inheritFromWidgetOfExactType as LiveKHProvider).liveKHBloc;
}
LiveKHProvider({Key key, Widget child}) : super(key: key, child: child);
}
最佳答案 我通过在InheritedWidget中包装传递给MaterialPageRoute的页面解决了这个问题.我假设树停在页面路线并且没有达到更高,尽管我不是100%肯定.