"Failed assertion:'initialValue == null || controller == null': is not true." Code Answer's

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Failed assertion:'initialValue == null || controller == null': is not true.

Powerful Polecat on May 21, 2021

You can't use initialValue and controller at the same time. So, a better way is to use controller because its constructor does provide you initial value that you can set.

Here is an example.

// In class level 
final controller = TextEditingController(text: "Your initial value");

Widget build(BuildContext context) {
  return TextFormField(
    controller: controller, 
    // ...
  );
}

In order to track the value entered by the user you can then use

controller.text

Source: stackoverflow.com

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"Failed assertion:'initialValue == null || controller == null': is not true." Code Answer's