title: How to get keyboardColor in Flutter?
body: <p><a href="https://api.flutter.dev/flutter/material/TextField/keyboardAppearance.html" rel="nofollow noreferrer">TextField</a> can set <code>keyboardAppearance</code> between <code>Brightness.light</code> / <code>Brightness.dark</code>, how to get the keyboard color while <code>light</code> / <code>dart</code> ?</p>