flutter底部弹出BottomSheet怎么实现

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效果图：

ModalBottomSheet

这个ModalBottomSheet就是类似一个Dialog，有一个半透明的背景层，然后上面显示你自定义的内容。 用法非常简单，Flutter提供了一个showModalBottomSheet的方法弹出一个BottomSheet。

实现代码：

class AddExpense extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _AddExpensePage();
}

class _AddExpensePage extends State<AddExpense> {
  List<Search> typeList = List<Search>();
  Search _search;
  bool _typeCheck = false;


  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _loadType();
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return  Column(
      children: <Widget>[
        Card(
          child: Row(
            children: <Widget>[
              SizedBox(
                width: 16.0,
              ),
              Text('报销类型：', style: TextStyle(fontSize: 16)),
              Expanded(
                child: ListTile(
                  title: Text(
                    _search.code ?? "报销类型",
                  ),
                  trailing: _typeCheck
                      ? Icon(Icons.keyboard_arrow_up)
                      : Icon(Icons.keyboard_arrow_down),
                  onTap: () {
                    setState(() {
                      _typeCheck = !_typeCheck;
                    });
                    showModalBottomSheet(
                      context: context,
                      builder: (BuildContext context) {
                        return ListView.separated(
                          itemCount: typeList.length,
                          separatorBuilder: (context, index) {
                            return Divider();
                          },
                          itemBuilder: (context, index) {
                            return ListTile(
                              title: Text(typeList[index].code),
                              trailing: Offstage(
                                offstage:
                                typeList[index].check ? false : true,
                                child: Icon(Icons.check),
                              ),
                              onTap: () {
                                for (int i = 0; i < typeList.length; i++) {
                                  i != index
                                      ? typeList[i].check = false
                                      : typeList[i].check = true;
                                }
                                _search = typeList[index];
                                Navigator.pop(context);
                              },
                            );
                          },
                        );
                      },
                    ).then((val) {
                      setState(() {
                        _typeCheck = !_typeCheck;
                      });
                    });
                  },
                ),
              )
            ],
          ),
        ),
      ],
    );
   
  }


  void _loadType() {
    String jsonData =
        '[{"code":"差旅费报销单","check":true},{"code":"一般费用报销单","check":false},{"code":"因公临时出国(境)支出表","check":false},{"code":"药费报销单","check":false},{"code":"合同付款审批表","check":false},{"code":"工资系统专用报销表","check":false}]';
    List<dynamic> list = json.decode(jsonData);
    list.forEach((element) {
      Search search = Search.fromJson(element);
      if (search.check) {
        setState(() {
          _search = search;
        });
      }
      typeList.add(search);
    });

  }
}

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