Flutterで生年月日をピックアプするModalを作成

ソースコード

birthday.dart

void showCupertinoDatePicker(BuildContext context) {
    showCupertinoModalPopup(
      context: context, 
      builder: (context) {
        final now = DateTime.now();
        return Container(
          height: MediaQuery.of(context).size.height * 0.3,
          child: CupertinoDatePicker(
            backgroundColor: Theme.of(context).focusColor,
            initialDateTime: DateTime(now.year - 18,12,31),
            minimumDate: DateTime(1900,12,31),
            maximumDate: DateTime(now.year - 6,12,31),
            mode: CupertinoDatePickerMode.date,
            onDateTimeChanged: (value){
              birthDay = value;
            }
          ),
        );
      }
    );
  }