Only static members can be accessed in initializers on TextEditingController - flutter

Question

GOAL: when editing information it goes to a Form that has an initial value equal to the information at present.
The code below works because it has the property 'initialValue'
TextFormField(
maxLines: 1,
autofocus: true,
initialValue: _currentProditem.producttitle,
style: TextStyle(
color: Colors.black87,
fontWeight: FontWeight.w400,
fontSize: 18.0,
fontFamily:'Cabin',
),
but the code below does not work because the properties 'initialValue' and 'controller' are conflicting. That's why I commented the property 'initialValue' in the code below. But I want to put the initialValue somewhere so I can achieve the above goal.
TextFormField(
controller: _controller,
maxLines: 1,
autofocus: true,
// initialValue: _currentProditem.price,
keyboardType: TextInputType.number,
onChanged: (string) {
string = '${_formatNumber(string.replaceAll(',', ''))}';
_controller.text = string;
Timer(Duration(milliseconds: 1), () {
_controller.selection = TextSelection.fromPosition(TextPosition(offset: string.length));
});
},
so I researched how to put IntialValue and found that you need to add the code below
final _controller = TextEditingController(text: 'some text');
I tried changing the the word 'some text' to '_currentProditem.price' but there was a problem with the word '_currentProditem' it says 'error: Only static members can be accessed in initializers.'
For reference the word '_currentProditem' can be found on the code below
class ItemNotifier with ChangeNotifier {
List<Proditem> _itemList = [];
Proditem _currentProditem;
UnmodifiableListView<Proditem> get itemList => UnmodifiableListView(_itemList);
Proditem get currentProditem => _currentProditem;
set itemList(List<Proditem> itemList) {
_itemList = itemList;
notifyListeners();
}
set currentProditem(Proditem proditem) {
_currentProditem = proditem;
notifyListeners();
}
}

Answer 1

only static fields can be accessed outside any method
so, just initialise the _controller empty
final _controller = TextEditingController();
while building or in initState set the value
_controller.text = currentPrice;
as the controller has a setter named text, its easy to update the value dynamically like when a button is pressed