Flutter中的多选按钮组件Checkbox

import 'package:flutter/material.dart';

class CheckBoxPage extends StatefulWidget {
    CheckBoxPage({Key key}) : super(key: key);
    @override
    _CheckBoxPageState createState() => _CheckBoxPageState();
}

class _CheckBoxPageState extends State<CheckBoxPage> {
   
    var status = true;
    var flag = true;
    var check = true;


    @override
    Widget build(BuildContext context) {
        return Scaffold(
            appBar:AppBar(
                title: Text("多选框"),
            ),
            body:Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children:<Widget>[ 

                    Row(
                        children:<Widget>[
                            // 选中框
                            Checkbox(
                                value:this.status,
                                // 改变后的事件
                                onChanged:(value){
                                    setState(() {
                                       this.status = value;
                                    });
                                },
                                // 选中后的颜色
                                activeColor: Colors.red,
                                // 选中后对号的颜色
                                checkColor: Colors.blue,
                            ),
                            Text(this.status?"选中":"取消")
                        ],
                    ),

                    SizedBox(height:10),
                    // 带标题的选中框
                    CheckboxListTile(
                        value:this.flag,
                        // 改变后的事件
                        onChanged:(value){
                            setState(() {
                                this.flag = value;
                            });
                        },
                        title:Text("标题"),
                        subtitle: Text("这是副标题"),
                        // 选中后的颜色
                        activeColor: Colors.red,
                        // 选中的文字是否跟着高亮
                        selected: this.flag,
                        // 选中后对号的颜色
                        checkColor: Colors.blue,
                    ),

                    SizedBox(height:10),
                    // 带图标和标题的选中框
                    CheckboxListTile(
                        value:this.check,
                        onChanged:(value){
                            setState(() {
                                this.check = value;
                            });
                        },
                        title:Text("标题"),
                        subtitle: Text("这是副标题"),
                        secondary: Icon(Icons.help),
                        activeColor: Colors.red,
                        selected: this.check,
                        checkColor: Colors.blue,
                    ),
                ],
            )
        );
    }
}