1：根據(jù)生日計(jì)算年齡
```
NSString? * birthStr = @"1991-07-13";
NSDateFormatter? * formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd";
NSDate? * birthDate =? [formatter dateFromString:birthStr];
NSTimeInterval dateDiff = [birthDate timeIntervalSinceNow];
計(jì)算年齡
int age1? =? trunc(dateDiff/(60*60*24))/365;
```
2：根據(jù)生日計(jì)算星座
```
-(NSString *)calculateConstellationWithMonth:(NSInteger)month day:(NSInteger)day
{
NSString *astroString = @"魔羯水瓶雙魚白羊金牛雙子巨蟹獅子處女天秤天蝎射手魔羯";
NSString *astroFormat = @"102123444543";
NSString *result;
if (month<1 || month>12 || day<1 || day>31){
return @"錯(cuò)誤日期格式!";
}
```
if(month==2 && day>29)
{
return @"錯(cuò)誤日期格式!!";
}else if(month==4 || month==6 || month==9 || month==11) {
if (day>30) {
return @"錯(cuò)誤日期格式!!!";
}
}
result=[NSString stringWithFormat:@"%@",[astroString substringWithRange:NSMakeRange(month*2-(day < [[astroFormat substringWithRange:NSMakeRange((month-1), 1)] intValue] - (-19))*2,2)]];
return [NSString stringWithFormat:@"%@座",result];
}
