isAdult method

bool isAdult()

判断是否成年

Implementation

bool isAdult() {
  if (this == null) {
    return false;
  }
  if (!RegexUtil.isIDCard18Exact(this!)) {
    return false;
  }

  // 解析身份证号码获取生日
  String birthDateString = this!.substring(6, 14);
  // 分别截取年月日
  int selectYear = int.parse(birthDateString.substring(0, 4));
  int selectMonth = int.parse(birthDateString.substring(4, 6));
  int selectDay = int.parse(birthDateString.substring(6, 8));
  // 获取当前年月日
  DateTime now = DateTime.now();
  int yearNow = now.year;
  int monthNow = now.month;
  int dayNow = now.day;
  // 用当前年减去出生年，例如2019-1-22 ，出生年日月是2011年-6-1
  //当前值是8
  int yearMinus = yearNow - selectYear;
  //当前值是-5，monthMinus大于0的情况下，证明满8周岁。等于0需要判断dayMinus，小于0的时候age-1
  int monthMinus = monthNow - selectMonth;
  //当前值是21，monthMinus大于0的情况下，配合monthMinus等于0的情况下，age等于原值。否则age等于age-1
  int dayMinus = dayNow - selectDay;
  // 先大致赋值
  int age = yearMinus;
  if (age <= 0) {
    age = 0;
  }
  if (monthMinus == 0) {
    if (dayMinus <= 0) {
      age = age - 1;
    }
  } else if (monthMinus < 0) {
    age = age - 1;
  }
  return age >= 18;
}