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

Future<void> alert(BuildContext context, String content, {String? title}) {
  var c = Completer();

  showCupertinoDialog(
    context: context,
    builder: (context) => CupertinoAlertDialog(
      title: title != null ? Text(title) : null,
      content: Text(content),
      actions: <Widget>[
        CupertinoDialogAction(
          isDefaultAction: true,
          onPressed: () {
            c.complete();
            Navigator.of(context).pop();
          },
          child: const Text("好"),
        ),
      ],
    ),
  );

  return c.future;
}

Future<bool> confirm(BuildContext context, String content,
    {String? title, String? positiveText, String? negativeText}) {
  var c = Completer<bool>();

  positiveText ??= "好";
  negativeText ??= "取消";

  showCupertinoDialog(
    context: context,
    builder: (context) => CupertinoAlertDialog(
      title: title != null ? Text(title) : null,
      content: Text(content),
      actions: <Widget>[
        CupertinoDialogAction(
          onPressed: () {
            Navigator.of(context).pop();
            c.complete(false);
          },
          child: Text(negativeText!),
        ),
        CupertinoDialogAction(
          isDefaultAction: true,
          onPressed: () {
            Navigator.of(context).pop();
            c.complete(true);
          },
          child: Text(positiveText!),
        ),
      ],
    ),
  );

  return c.future;
}