参数类型“Function”无法分配给参数类型“void Function()”？零安全后

我想实现制作一个抽屉，上面放有不同的物品，所以我正在为DrawerItems并使用构造函数将数据传递到主文件。但我收到以下错误onPressed功能：

"The argument type 'Function' can't be assigned to the parameter type 'void Function()'"

class DrawerItem extends StatelessWidget {
    
      final String text;
      final Function onPressed;
    
      const DrawerItem({Key key, this.text, this.onPressed}) : super(key: key);
    
      @override
      Widget build(BuildContext context) {
        return FlatButton(
          child: Text(
            text,
            style: TextStyle(
              fontWeight: FontWeight.w600,
              fontSize: 18.0,
            ),
          ),
          onPressed: onPressed,
        );
      }
    }

有人知道为什么吗？

更改您的代码以接受VoidCallback代替Function为了onPressed.
顺便一提VoidCallback只是简写void Function()所以你也可以将其定义为final void Function() onPressed;

更新的代码：

class DrawerItem extends StatelessWidget {
    
      final String text;
      final VoidCallback onPressed;
    
      const DrawerItem({Key key, this.text, this.onPressed}) : super(key: key);
    
      @override
      Widget build(BuildContext context) {
        return FlatButton(
          child: Text(
            text,
            style: TextStyle(
              fontWeight: FontWeight.w600,
              fontSize: 18.0,
            ),
          ),
          onPressed: onPressed,
        );
      }
    }