flutter日期选择器 flutter时间选择器

 //设置默认显示的日期为当前 DateTime initialDate = DateTime.now();  void showDefaultYearPicker(BuildContext context) async {  final DateTime dateTime = await showDatePicker(   context: context,   //定义控件打开时默认选择日期   initialDate: initialDate,   //定义控件最早可以选择的日期   firstDate: DateTime(2018, 1),   //定义控件最晚可以选择的日期   lastDate: DateTime(2022, 1),   builder: (BuildContext context, Widget child) {    return Theme(     data: CommonColors.themData,     child: child,    );   },  );  if (dateTime != null && dateTime != initialDate) {} }

 //设置显示显示的时间为当前 TimeOfDay initialTime = TimeOfDay.now(); void showDefaultDatePicker(BuildContext context) async {  final TimeOfDay timeOfDay = await showTimePicker(   context: context,   initialTime: initialTime,   builder: (BuildContext context, Widget child) {    return Theme(     data: CommonColors.themData,     child: child,    );   },  );  if (timeOfDay != null && timeOfDay != initialTime) {   setState(() {    initialTime = timeOfDay;   });  } }