How to make the icon in TextFormField enabled in code?

I have set a color to an icon in a TextFormField, but the color only comes when the TextFormField is focused.

How do I set it so that upon a setState() the icon stays ‘focused’ or colored?

>Solution :

try this:

bool _textIsEmpty = true;
TextEditingController _controller= TextEditingController();
... // rest of your code

TextField(
  controller: _controller,
  decoration: InputDecoration(
    icon: Icon(
      Icons.abc,
      color: _textIsEmpty ? Colors.transparent : Colors.pink,
    ),
  ),
  onChanged: (value) {
    setState(() {
      _textIsEmpty = value.isEmpty;
    });
  },
),