How to get a value from class in StatefulWidget in flutter?-CodePudding

I am new in flutter and i have some codes to build textfield. i want to make an initial value in textfield but this is from input in another class.

class TextFieldEdit extends StatefulWidget {
  TextFieldEdit({
    Key? key,
    required this.title,
    required this.hintTxt,
    required this.controller,
    required this.defaultTxt,
  }) : super(key: key);

  final String title, hintTxt;
  final controller;
  final defaultTxt;

  @override
  State<TextFieldEdit> createState() => _TextFieldEditState();
}

class _TextFieldEditState extends State<TextFieldEdit> {
  
  TextEditingController _controller = TextEditingController();
  
  @override
  void initState() {
    super.initState();
    _controller.text = defaultTxt;
  }

  @override
  Widget build(BuildContext context) {
    return ...
}

in _TextFieldEditState class at the _controller.text i want to get value from defaultTxt in TextFieldEdit class. But how can i send it to _TextFieldEditState class?

the error message is : Undefined name 'defaultTxt'. Try correcting the name to one that is defined, or defining the name.

CodePudding user response：

Use widget. to access to the variable in constructor:

@override
  void initState() {
    super.initState();
    _controller.text = widget.defaultTxt;
  }

CodePudding user response：

To access the widget variable follow widget.variableName

You can do

  late final TextEditingController _controller =
      TextEditingController.fromValue(
          TextEditingValue(text: widget.defaultTxt));

Or use initState to assign the _controller.