NSDate是否为当天

- (BOOL)dateIsToday:(NSDate *)aDate{
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:[NSDate date]];
    NSDate *today = [cal dateFromComponents:components];
    components = [cal components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:aDate];
    NSDate *otherDate = [cal dateFromComponents:components];
   
    if([today isEqualToDate:otherDate]) {
        return YES;
    }else{
        return NO;
    }
}