fluttertoast官方package

如何使用：

1. 添加依赖库：
   fluttertoast: ^2.1.1
2. 导入：
   import 'package:fluttertoast/fluttertoast.dart';
3. 示例：

Fluttertoast.showToast(
        msg: "This is Center Short Toast",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIos: 1,
        bgcolor: "#e74c3c",
        textcolor: '#ffffff'
    );

  Fluttertoast.showToast(
      msg: "网络连接错误",
      toastLength: Toast.LENGTH_SHORT,
      gravity: ToastGravity.BOTTOM,
      timeInSecForIos: 1,
      bgcolor: "#9E9E9E",
      textcolor: '#ffffff');
}