【ios】判断日期是今天

    NSDate *currentDate = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:currentDate];

    NSDate *today = [calendar dateFromComponents:components];

    components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:self.birthday];

    NSDate *otherDate = [calendar dateFromComponents:components];

    if([today isEqualToDate:otherDate]) {

　　　　　　NSLog(@"today");

    }