label_textfield_ui.dart

@override
Widget build(BuildContext context) {
  return Stack(
    children: <Widget>[
      Align(
        alignment: Alignment.bottomLeft,
        child: Text(
          (isShowHintText) ? '' : overlapText,
          textAlign: TextAlign.start,
          style: (txtController.text.isEmpty) ? widget.lblNormalStyle : widget.lblHighlightStyle,
        ),
      ),

      Padding(
        padding: const EdgeInsets.fromLTRB(0, 10, 0, 0),
        child: TextField(
          style: widget.txtStyle,
          textAlign: TextAlign.left,
          decoration: InputDecoration(
            border: (widget.showBorder) ? UnderlineInputBorder() : InputBorder.none,
            hintText: (isShowHintText) ? widget.hintText : '',
          ),
        ),  
      ),
    ],
  );
}