[移动开发]Flutter CustomalertView

import 'package:flutter/material.dart';

typedef IndexCallback = void Function(int index);

// ignore: avoid_types_as_parameter_names
Widget showAlertView(String title, String content, BuildContext context,
    {Key key, IndexCallback callBack}) {
  showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext showContext) {
        return AlertDialog(
          title: Container(
            alignment: Alignment.center,
            child: Text(title),
          ),
          content: SingleChildScrollView(
            child: ListBody(
              children: <Widget>[
                Container(
                  alignment: Alignment.center,
                  child: Text(content),
                ),
              ],
            ),
          ),
          actionsAlignment: MainAxisAlignment.spaceBetween,
          actions: <Widget>[
            FlatButton(
              child: Text('取消'),
              onPressed: () {
                Navigator.of(showContext).pop();
                callBack(0);
              },
            ),
            FlatButton(
              child: Text('确定'),
              onPressed: () {
                callBack(1);
                Navigator.of(showContext).pop();
              },
            ),
          ],
        );
      }).then((value) => print(value));
}