更改我的应用栏中 BackButon() 的图标

Question

应用程序栏：应用程序栏（ 前导：后退按钮（ 按下时：() { Get.off(exercisePage()); }, ),

    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.only(
          bottomLeft: Radius.circular(30),
          bottomRight: Radius.circular(30)),
    ),
    automaticallyImplyLeading: false,
    title: Padding(
      padding: const EdgeInsets.only(left: 25),
      child: Text(
        'Regular exercise',
        style: TextStyle(
            fontFamily: 'FontMain', fontSize: 22, color: Colors.indigo),
      ),
    ),
    backgroundColor: Color.fromARGB(255, 231, 235, 237),
   
  ),

我的应用栏中有一个 BackButon() ，我想更改 FLUTTER 中 BackButton 的默认图标。

Answer 1

   appBar: AppBar(
      automaticallyImplyLeading: false,
      leading: GestureDetector(
        onTap: () {
          Navigator.pop(context);
        },
        child: const Icon(
          Icons.arrow_back, // This is icon for change for your side
          color: Colors.black,
        ),
      ),
      centerTitle: false,
      backgroundColor: Colors.white,
      elevation: 0,
      title: const Text(
        "Testing",
        style: TextStyle(
            color: Colors.black,
            fontSize: 22,
            fontWeight: FontWeight.w400),
      ),
    ),

Answer 2

appBar: AppBar(
  leading: IconButton(
    icon: Icon(Icons.arrow_back, color: Colors.black),
    onPressed: () => Navigator.of(context).pop(),
  ), 
  title: Text("Sample"),
  centerTitle: true,
),