我試圖在觀看此視頻時實作登錄表單（20:00 分鐘）（https://www.youtube.com/watch?v=GFKqoIAPd0Q），直到這一部分一切都很好：
class InputText extends StatelessWidget {
final String label;
final String hint;
final Icon icono;
final TextInputType keyboard;
final bool obsecure;
final void Function(String data) onChanged;
final String Function(String data) validator;
const InputText({ Key? key,
this.label = '',
this.hint = '',
required this.icono,
this.keyboard = TextInputType.text,
this.obsecure = false,
required this.onChanged,
required this.validator})
: super(key: key);
@override
Widget build(BuildContext context) {
return Container(
child: TextFormField(
keyboardType: this.keyboard,
obscureText: this.obsecure,
onChanged: this.onChanged,
validator: validator, // THIS LINE RIGHT HERE
decoration: InputDecoration(
hintText: this.hint,
labelText: this.label,
labelStyle: TextStyle(那里的驗證器給出了一個錯誤，但在視頻中它作業正常。我目前正在使用 Flutter 2.10.3 版和 Dart SDK 2.16.1 版。有誰知道如何解決這個問題？提前致謝
uj5u.com熱心網友回復：
將宣告更改validator為：
final String? Function(String? data) validator;
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