CupertinoActionSheet iOS行为单

iOS风格的弹出选择结构，可放多的按钮，一般与CupertinoActionSheetAction联用。

相关组件

CupertinoActionSheetAction

CupertinoActionSheet基本使用

【title】 : 第一行组件 【Widget】
【message】 : 第二行组件 【Widget】
【cancelButton】 : 取消按钮处组件 【Widget】
【actions】 : 中间组件列表 【List】

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
class CustomCupertinoActionSheet extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        _buildRaisedButton(context),
        _buildCupertinoActionSheet(context),
      ],
    );
  }
  Widget _buildCupertinoActionSheet(BuildContext context) =>
      Container(
        alignment: Alignment.bottomCenter,
        child: CupertinoActionSheet(
          title: Text("Please chose a language"),
          message: Text('the language you use in this application.'),
          cancelButton: CupertinoActionSheetAction(
              onPressed: () => Navigator.pop(context), child: Text("Cancel")),
          actions: <Widget>[
            CupertinoActionSheetAction(
                onPressed: () => Navigator.pop(context), child: Text('Dart')),
            CupertinoActionSheetAction(
                onPressed: () => Navigator.pop(context), child: Text('Java')),
            CupertinoActionSheetAction(
                onPressed: () => Navigator.pop(context), child: Text('Kotlin')),
          ],
        ),
      );
  Widget _buildRaisedButton(BuildContext context) => RaisedButton(
        shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(10))),
        color: Colors.blue,
        onPressed: () => showDialog(
            context: context,
            builder: (ctx) => _buildCupertinoActionSheet(context)),
        child: Text(
          'Just Show It !',
          style: TextStyle(color: Colors.white),
        ),
      );
}