Most times, the currentState ofFooViewKeyorBarViewKeyis returned with a null value. I tried debugging and found that thoseGlobalKeys are missing from theGlobalKey._registry. I'm not able to predict the cases when they have values and when they are null. ...
int counterReducer(int state, dynamic action) { return action == Actions.Increment ? state + 1 : state; } void main() { // Create your store as a final variable in the main function or inside a // State object. This works better with Hot Reload than creating it directly // in the...
stackTrace); } Future<Null> main() async { //注册Flutter框架的异常回调 FlutterError.onError = (FlutterErrorDetails details) async { //转发至Zone的错误回调 Zone.current.handleUncaughtError(details.exception, details.stack); }; //自定义错误提示页面 ErrorWidget...
// // Every time the button is tapped, an action is dispatched and // run through the reducer. After the reducer updates the state, // the Widget will be automatically rebuilt with the latest // count. No need to manually manage subscriptions or Streams! StoreConnector<int, String>( ...
Flutter问题:类型“Null”不是“DateTime”的子类型 我正在寻找个人项目的帮助。基本上,我把日历作为一个应用程序抽屉选项,当我还在日历页面和热重新加载时,它一直在工作,但现在在热重启后,它不断向我显示这个错误 type 'Null' is not a subtype of type 'DateTime'...
接下来,我们可以通过BuildContext来获取NavigatorState对象,进而进行页面间的导航操作。 // 使用push方法跳转到新页面Navigator.of(context).push(MaterialPageRoute(builder: (context) => NewPage()));// 使用pop方法返回上一个页面Navigator.of(context).pop(); ...
Default:默认模式,生成三个文件:state,logic,view Easy:简单模式,生成俩个文件:logic,view Module Name:模块的名称,请使用大驼峰或小驼峰命名 插件详细功能说明,请查阅:GetX代码生成IDEA插件,超详细功能讲解 安装 在设置里面选择:Plugins ---> 输入“getx”搜索 ---> 选择名字为:“GeX” ---> 然后安装 ---...
= current.isShimmerLoading, builder: (context, state) { return GestureDetector( onTap: () { bloc.add(const HomePageInitiated()); }, child: ..., ); }, ) ), ), ); } 这样做的优势也很明显: • 业务逻辑分离: Bloc 架构将业务逻辑从 UI 中分离,使代码更具可读性和可维护性,同时便于单...
_formKey在 Flutter 中通常是作为一个GlobalKey<FormState>实例来使用,主要用于管理Form组件。它提供了对表单的控制,使得开发者可以在表单外部执行一些操作,如验证表单、保存表单数据、重置表单等。 3.2._formKey 的主要用法 验证表单(Validating the Form):通过_formKey.currentState.validate()可以触发表单中每个Form...
StateError错误,就是_positions.single这一行抛出: abstractclassIterable<E> {//...Egetsingle { Iterator<E> it = iterator;if(!it.moveNext())throwIterableElementError.noElement(); E result = it.current;if(it.moveNext())throwIterableElementError.tooMany();returnresult; ...