Widget buildMultiArea(BuildContext context) {
    return GestureDetector(
      onTap: (){
        TDPicker.showMultiLinkedPicker(context, title: '选择地区',
            onConfirm: (selected) {
              setState(() {
                selected_3 = '${selected[0]} ${selected[1]} ${selected[2]}';
              });
              Navigator.of(context).pop();
            },
            data: data_3,
            columnNum: 3,
            initialData: ['浙江省', '杭州市', '西湖区']);
      },
      child: buildSelectRow(context, selected_3, '选择地区'),
    );
  }