类型“字符串”不是“函数结果”的类型“列表<字符串>”的子类型

Question

声明为：

List<String> _questionText = new List(creatingQuiz.totalQuestionsCount);

执行此：

TextFormField(
            validator: (value) {
              if (value.isEmpty) {
                return 'Cannot be empty';
              } else {
                _questionText[qCount] = value;
                return null;
              }
            },
            decoration:
                InputDecoration(labelText: "Question number $count"),
          ),

列表类型为字符串，值也为字符串类型。 仍然出现此类型错误：

type 'String' is not a subtype of type 'List<String>' of 'function result'

这是堆栈跟踪

When the exception was thrown, this was the stack
#0      _questionText (package:myshipapp/QuizApp/addQuestions.dart)
#1      _MyHomePageState.question.<anonymous closure> 
        package:myshipapp/QuizApp/addQuestions.dart:94
#2      FormFieldState._validate 
        package:flutter/…/widgets/form.dart:392
#3      FormFieldState.validate.<anonymous closure> 
        package:flutter/…/widgets/form.dart:385
#4      State.setState 
package:flutter/…/widgets/framework.dart:1233

Answer 1

List<String> _questionText = new List<String>(creatingQuiz.totalQuestionsCount);

我的声明不正确。谢谢大家。