Flutter 一个高度可定制的模式进度指示器与淡出动画 loading 组件

ProgressHUD(
        child: Builder(
          builder: (context) => Center(
                child: Column(
                  children: <Widget>[
                    RaisedButton(
                      child: Text('Show for a second'),
                      onPressed: () {
                        final progress = ProgressHUD.of(context);
                        progress.show();
                        Future.delayed(Duration(seconds: 1), () {
                          progress.dismiss();
                        });
                      },
                    ),
                    RaisedButton(
                      child: Text('Show with text'),
                      onPressed: () {
                        final progress = ProgressHUD.of(context);
                        progress.showWithText('Loading...');
                        Future.delayed(Duration(seconds: 1), () {
                          progress.dismiss();
                        });
                      },
                    ),
                  ],
                ),
              ),
        ),
      ),

https://pub.dev/packages/flutter_progress_hud