how to change the 'primarySwatch' to white in the app bar - Flutter?

This is what I have:

,

I want to change the blueGrey (portion marked in red) to white. While trying to change this from

        primarySwatch: Colors.blueGrey,

to

        primarySwatch: Colors.white,

en error is showing as "The argument type 'Color' can't be assigned to the parameter type 'MaterialColor?'. "

I want to get it like this:

Tried to change the primarySwatch to 'Colors.White', created a class 'basicColors'and added colors(colorHexcode) to variables in the class. Tried to call them in the position of 'Colors.white' as 'basicColors.varibleName'. Didn't work though.

CodePudding user response：

Add below code in your main() function and import below library

import 'package:flutter/services.dart';

inside main function

  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
    ),
  );