class UserList extends StatelessWidget {
Widget build(BuildContext context) {
final但是,我得到了type 'List<Widget>' is not a subtype of type 'Widget'错误。在这种情况下,如何将List<Widget>类型转换为Widget类型?
type 'Future<bool>' is not a subtype of type 'bool' in type cast 以下是导致错误的源代码: Future<bool> fetchCoursesif (courses.length == 0) { } else { }..
boolhasCourses = fetchC
我的问题是,我有一个routeLogin函数,我创建的选择之间的主页和登陆页。我得到了这个错误: I/flutter ( 9026): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 9026): The following assertion was thrown buil
我正在尝试创建一个页面,该页面在打开页面时显示来自资源的PDF。PDF加载,但每次加载前都会在标题中抛出错误。我很确定这与函数的调用方式有关,但我不知道如何解决它。我的代码示例: class Calendar2020PDFScreen extends StatefulWidget { State<StatefulWidget> createStateCalendar2020PDFScreenState();
class _Calendar2020PDFScreenState extends St
我有一个问题,将步进类型从垂直改为水平。body: new ListView.builder(
I/flutter (10148):呈现库╞═════════════════════════════════════════════════════════I/flutter(10148)捕获的══╡异常:在performLayout()期间抛出以下断言: