如何使用：
添加依赖库：

  flutter_easyloading: ^3.0.3

导入：

import 'package:flutter_easyloading/flutter_easyloading.dart';

EasyLoading.show(status: 'loading...'); 

EasyLoading.showProgress(0.3, status: 'downloading...');

EasyLoading.showSuccess('Great Success!');

EasyLoading.showError('Failed with Error');

EasyLoading.showInfo('Useful Information.');

EasyLoading.dismiss();