flutter 延時函數delay Loading頁面

loading 頁面

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class Loading {
  static bool isLoading = false;

  static void showLoading(BuildContext context) {
    if (!isLoading) {
      isLoading = true;
      showGeneralDialog(
          context: context,
          barrierDismissible: false,
          barrierLabel:
              MaterialLocalizations.of(context).modalBarrierDismissLabel,
          transitionDuration: const Duration(milliseconds: 150),
          pageBuilder: (BuildContext context, Animation animation,
              Animation secondaryAnimation) {
            return Align(
              child: ClipRRect(
                borderRadius: BorderRadius.circular(10),
                child: Container(
                  width: 100,
                  height: 100,
                  color: Colors.black54,
                  child: CupertinoActivityIndicator(),
                ),
              ),
            );
          }).then((v) {
        isLoading = false;
      });
    }
  }

  static void hideLoading(BuildContext context) {
    if (isLoading) {
      Navigator.of(context).pop();
    }
  }
}

延時函數

            FlatButton(
              child: Text('點擊loading'),
              onPressed: () {
                //loading
                Loading.showLoading(context);
                Future.delayed(Duration(milliseconds: 2000), () {
                  //關閉loading
                  Loading.hideLoading(context);
                });
                print('aaaa');
              },
            ),