How to create a number input field in Flutter? Only 10 digital

To limit the number of digits entered in a TextField widget to 10 digits, you can use the inputFormatters property of the TextField widget.

TextEditingController _controller = TextEditingController();
final tenDigitsOnly = new RegExp(r'^\d{0,10}$');

TextField(
  controller: _controller,
  keyboardType: TextInputType.number,
  inputFormatters: [
    FilteringTextInputFormatter.allow(tenDigitsOnly)
  ],
)

In this code, we have created a regular expression tenDigitsOnly that matches only digits and has a maximum length of 10. Then we have passed it to the FilteringTextInputFormatter.allow() method which allows only characters that match the provided regular expression.

By using this code, the user will only be able to enter up to 10 digits in the TextField.