change navgiation buttoon on app bar color flutter code example

Example 1: how to change the color of the back button in app bar flutter

appBar: AppBar(
  iconTheme: IconThemeData(
    color: Colors.black, //change your color here
  ),
  title: Text("Sample"),
  centerTitle: true,
),

Example 2: change color icon tabbar flutter

appBar: AppBar(
        brightness: Brightness.dark,
        iconTheme: IconThemeData(color: Colors.white),
        title: Text("Title TabBar"),
)