dependOnInheritedWidgetOfExactType 是Flutter 框架中的一个核心方法,用于在 Widget 树中查找并依赖特定类型的 InheritedWidget。当这个 InheritedWidget 的数据发生变化时,依赖它的 Widget 会被通知并重新构建。这个方法通常用于实现状态管理或数据共享功能,允许子 Widget 访问和响应上层 InheritedWidget 中的数据变化。 2....
of(context).brightness == Brightness.dark ? SystemUiOverlayStyle.light : SystemUiOverlayStyle.dark); super.initState(); } 把布局放到initState之后就行了 @override Widget build(BuildContext context) { SystemChrome.setSystemUIOverlayStyle( Theme.of(context).brightness == Brightness.dark ? SystemUi...
今天调试flutter程序时报错。程序运行时报如下错误: type ‘Future<int>’ is not a subtype of type ‘int’ in type cast 错误源码 int order = DatabaseHelper.dbhelper.getTaskGroupRelationOrder() as int; TaskGroupRelation relation = TaskGroupRelation( id:0, taskId:snapshot.data?[index].id, grou...
import'package:flutter_typeahead/flutter_typeahead.dart'; The package comes in both Material and Cupertino widget flavors. All parameters identical, the only changes are the visual defaults. Basic TypeAheadField<City>( suggestionsCallback:(search)=>CityService.of(context).find(search), builder:(conte...
此错误由**inheritFromWidgetOfExactType**方法引起。
API略有变化。现在，该方法不再使用Type作为参数，而是泛型的。之前：
inheritFromWidgetOfExactType flutter2.0改版,context.inheritFromWidgetOfExactType(ConterProvider);替换为context.dependOnInheritedWidgetOfExactType(aspect:ConterProvider);
Dart 是 AOT（Ahead Of Time）编译的，编译成快速、可预测的本地代码，使 Flutter 几乎都可以使用 ...
JS 与 Flutter 端提供事件层 NEJFMessager 进行交互，通过 Widget 树驱动 Flutter 引擎完成 UI 渲染。
When the parsing of an image fails, the error builder will return a shrink box. The spacing of the overflowbar will add an empty space in the front. Proposal Allow errorBuilder to be of type Widget? instead of Widget so this problem can be solved. There is currently no other way to ...