请看我的代码:classHomePageStateextendsState{bool_isLoading=false;.....@overrideWidgetbuild(BuildContextcontext){vardrawerOptions=[];......drawerOptions.add(newListTile(leading:newIcon(Icons.account_balance),title:newText(Strings.menu_change_city),onTap:()=>createDialog()));if(_isLoading)returnbuildBus
请看我的代码:classHomePageStateextendsState{bool_isLoading=false;.....@overrideWidgetbuild(BuildContextcontext){vardrawerOptions=[];......drawerOptions.add(newListTile(leading:newIcon(Icons.account_balance),title:newText(Strings.menu_change_city),onTap:()=>createDialog()));if(_isLoading)returnbuildBus
我试图将第一次按钮设置为禁用,当用户输入数量时它被启用,按钮禁用工作正常但是当我在TextFormField中输入数量时它给出以下错误。I/flutter(29519):══╡EXCEPTIONCAUGHTBYWIDGETSLIBRARY╞═══════════════════════════════════════════════════════════I/flutter(29519):ThefollowingassertionwasthrownbuildingTextFormField(dirty,state:_TextFormFieldState#b89da):I/flutter
我试图将第一次按钮设置为禁用,当用户输入数量时它被启用,按钮禁用工作正常但是当我在TextFormField中输入数量时它给出以下错误。I/flutter(29519):══╡EXCEPTIONCAUGHTBYWIDGETSLIBRARY╞═══════════════════════════════════════════════════════════I/flutter(29519):ThefollowingassertionwasthrownbuildingTextFormField(dirty,state:_TextFormFieldState#b89da):I/flutter
classMyHomeextendsStatefulWidget{@overrideStatecreateState()=>newMyHomePage2();}classMyHomePage2extendsState{Listitems=newList();buildlist(Strings){setState((){print("enteredbuildlist"+s);Listrefresh=newList();if(s=='button0'){refresh=[newRefreshments("Watermelon",250),newRefreshments("Orange",2
classMyHomeextendsStatefulWidget{@overrideStatecreateState()=>newMyHomePage2();}classMyHomePage2extendsState{Listitems=newList();buildlist(Strings){setState((){print("enteredbuildlist"+s);Listrefresh=newList();if(s=='button0'){refresh=[newRefreshments("Watermelon",250),newRefreshments("Orange",2
我想创建一个可以根据设备方向更新UI的应用程序。在Portait布局中,我使用抽屉来显示一些元素(Fig.)。在横向布局中,没有抽屉,但元素显示在屏幕左侧的一列中(Fig.)。该程序在抽屉关闭时运行。但是当我在打开抽屉的情况下将方向从纵向切换到横向时,我收到错误消息“setState()ormarkNeedsBuild()calledwhenwidgettreewaslocked”堆栈提供此信息:Builtbuild\app\outputs\apk\debug\app-debug.apk.I/FlutterActivityDelegate(28527):onResumesettingc
我正在创建一个无限滚动的listView,我想在_loadNames函数中使用setState将_loadingState字符串从'loading...'更改为'loaded',但是当从itemBuilder调用_loadNames时,我得到“在构建错误期间调用的setState”。使用RefreshIndicator工作正常并更新项目,但滚动到底部会导致错误。我怎样才能从ListViews构建器调用_loadNames而不会出现错误,或者我可以使用什么其他方法。注意:不想使用redux或bloc。class_HomePageStateextendsState{Listnames=[]
我无法找到此异常的来源,而且该应用程序非常复杂,因此很难显示代码的任何相关部分。这是我发生错误时的存储库:Githubrepo我怀疑以下代码可能是肇事者:WidgetbuildResultCard(Mapresult,BuildContextcontext){Stringname=result["value"];Stringdescription=result["label"].replaceAll(newRegExp(r""),"");TextEditingControllercontroller=newTextEditingController(text:name);Functio