[英]I am getting this error styling my portfolio in flutter
import 'package:flutter/material.dart';
class ThemeSwitcher extends InheritedWidget {
final _ThemeSwitcherWidgetState data; // We'll use ThemeSwitcher to get access to the current state of ThemeSwitcherWidget
const ThemeSwitcher({
Key key,
@required this.data,
@required Widget child,
}) : assert(child != null),
super(key: key, child: child);
static _ThemeSwitcherWidgetState of(BuildContext context) { //This method returns the current state of the ThemeSwitcherWidget. This will be used down the tree
return (context.dependOnInheritedWidgetOfExactType(ThemeSwitcher)
as ThemeSwitcher)
.data;
}
@override
bool updateShouldNotify(ThemeSwitcher old) {
return this != old;
}
}
class ThemeSwitcherWidget extends StatefulWidget {
final bool initialDarkModeOn; // this is the initial state of the variable
final Widget child; // child to which this boolean variable should be propagated upon change. This will be our app in this case
ThemeSwitcherWidget({Key key, this.initialDarkModeOn, this.child})
: assert(initialDarkModeOn != null),
assert(child != null),
super(key: key);
@override
_ThemeSwitcherWidgetState createState() => _ThemeSwitcherWidgetState();
}
class _ThemeSwitcherWidgetState extends State<ThemeSwitcherWidget> {
bool isDarkModeOn;
void switchDarkMode() { //method used to toggle dark mode during the runtime of the app
setState(() {
isDarkModeOn = !isDarkModeOn;
});
}
@override
Widget build(BuildContext context) {
isDarkModeOn = isDarkModeOn ?? widget.initialDarkModeOn; // this is the build method which would build the widget tree with the above info
return ThemeSwitcher(
data: this,
child: widget.child,
);
}
}
位置 arguments 太多:預期為 0,但找到了 1。 嘗試刪除額外的位置 arguments,或指定名為 arguments 的名稱。
這是我在嘗試了許多方法后不斷面臨的問題。
我想知道如何解決這個問題,因為我沒有從搜索中得到任何好的解決方案。
在代碼的 _ThemeSwitcherWidgetState of(BuildContext context)方法中返回以下語句:
return (context.dependOnInheritedWidgetOfExactType<ThemeSwitcher>()).data;
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