原代码:
onChanged: (date) {
setState(() {
_selectedDate = date;
});
},
解决方案:
onChanged: (date) {
(context as Element).markNeedsBuild();
_selectedDate = date;
},
参考文档:
7.7 对话框详解: https://book.flutterchina.club/chapter7/dailog.html#_7-7-1