Offstate 包裹了Column 列表时候，外面得包裹一层 Expand,如果不包裹，就会溢出
Expanded(
child: settingMainSelect(),
),
//子widget组件
Widget settingMainSelect(){
return !is_tixing ? Container():
Offstage(
offstage:false,
child:
Column(
children:<Widget>[
Container(
color: Colours.color_f5f5f5,
height: 7,
),
Container(
height: 40,
padding: EdgeInsets.only(left: 12, right: 12),
alignment: Alignment.centerLeft,
child: Text("提示：",style: TextStyle(color: Color(0xff999999), fontSize: 13),),
decoration: BoxDecoration(color:Color(0xffF5F5F5),border: Border(bottom: BorderSide(width: 0.5, color: Colours.color_eeeeee),) ),
),
]
)
)
}
