SystemUiOverlayStyle systemUiOverlayStyle =
  const SystemUiOverlayStyle(
    statusBarColor: Colors.transparent,//狀態(tài)欄
    systemNavigationBarColor:Color(0xffffffff),//虛擬按鍵背景色
    systemNavigationBarDividerColor: Colors.transparent,
    systemNavigationBarIconBrightness: Brightness.dark,//虛擬按鍵圖標(biāo)色
    statusBarIconBrightness: Brightness.light,
    statusBarBrightness: Brightness.light,
  );
  SystemChrome.setSystemUIOverlayStyle(systemUiOverlayStyle);

放在 main(){}最后面

在頁面 里也可以修改

  @override
  Widget build(BuildContext context) {
  SystemUiOverlayStyle systemUiOverlayStyle =
  const SystemUiOverlayStyle(
    statusBarColor: Colors.transparent,//狀態(tài)欄
    systemNavigationBarColor:Color(0xffffffff),//虛擬按鍵背景色
    systemNavigationBarDividerColor: Colors.transparent,
    systemNavigationBarIconBrightness: Brightness.dark,//虛擬按鍵圖標(biāo)色
    statusBarIconBrightness: Brightness.light,
    statusBarBrightness: Brightness.light,
  );

    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: systemUiOverlayStyle, //SystemUiOverlayStyle.dark,
      child: ..., //getBody
    );
  }