我需要访问一个在我的有状态小部件的状态中声明和定义的变量：

class StatItemDeclarable extends StatefulWidget {
  const StatItemDeclarable({Key? key, required this.title, required this.index}) : super(key: key);

  final String title;
  final int index;
  
  //Need to access variables here

  @override
  State<StatItemDeclarable> createState() => _StatItemDeclarableState(title: title, index: index);
}

class _StatItemDeclarableState extends State<StatItemDeclarable> {

  _StatItemDeclarableState({required this.title, required this.index});

  String title; // Variable to access
  final _titleController = TextEditingController();
  final int index;
  bool deleted = false;
  late Color _color; // Variable to access

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我是一个新手，所以我会很感激一些帮助：）
我想要访问的变量在StatefulWidget中不可访问